Relevant bibliographies by topics / Two Bose-Einstein condensates

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Academic literature on the topic 'Two Bose-Einstein condensates'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Two Bose-Einstein condensates"

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Viet Hoa, Le, Nguyen Tuan Anh, Nguyen Chinh Cuong, and Dang Thi Minh Hue. "HYDRODYNAMIC INSTABILITIES OF TWO-COMPONENT BOSE-EINSTEIN CONDENSATES." Journal of Science, Natural Science 60, no. 7 (2015): 121–28. http://dx.doi.org/10.18173/2354-1059.2015-0041.

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SHI, YU. "ENTANGLEMENT BETWEEN BOSE–EINSTEIN CONDENSATES." International Journal of Modern Physics B 15, no. 22 (September 10, 2001): 3007–30. http://dx.doi.org/10.1142/s0217979201007154.

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For a Bose condensate in a double-well potential or with two Josephson-coupled internal states, the condensate wavefunction is a superposition. Here we consider coupling two such Bose condensates, and suggest the existence of a joint condensate wavefunction, which is in general a superposition of all products of the bases condensate wavefunctions of the two condensates. The corresponding many-body state is a product of such superposed wavefunctions, with appropriate symmetrization. These states may be potentially useful for quantum computation. There may be robustness and stability due to macroscopic occupation of a same single particle state. The nonlinearity of the condensate wavefunction due to particle–particle interaction may be utilized to realize nonlinear quantum computation, which was suggested to be capable of solving NP-complete problems.
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Viet Hoa, Le, Nguyen Tuan Anh, Le Huy Son, and Nguyen Van Hop. "THE INTERFACE PROPERTIES OF TWO-COMPONENT BOSE-EINSTEIN CONDENSATES." Journal of Science, Natural Science 60, no. 7 (2015): 88–93. http://dx.doi.org/10.18173/2354-1059.2015-0037.

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Liu, Zuhan. "Two-component Bose–Einstein condensates." Journal of Mathematical Analysis and Applications 348, no. 1 (December 2008): 274–85. http://dx.doi.org/10.1016/j.jmaa.2008.07.033.

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TSURUMI, TAKEYA, HIROFUMI MORISE, and MIKI WADATI. "STABILITY OF BOSE–EINSTEIN CONDENSATES CONFINED IN TRAPS." International Journal of Modern Physics B 14, no. 07 (March 20, 2000): 655–719. http://dx.doi.org/10.1142/s0217979200000595.

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Bose–Einstein condensation has been realized as dilute atomic vapors. This achievement has generated immense interest in this field. This article review of recent theoretical research into the properties of trapped dilute-gas Bose–Einstein condensates. Among these properties, stability of Bose–Einstein condensates confined in traps is mainly discussed. Static properties of the ground state are investigated by using the variational method. The analysis is extended to the stability of two-component condensates. Time-development of the condensate is well-described by the Gross–Pitaevskii equation which is known in nonlinear physics as the no nlinear Schrödinger equation. For the case that the inter-atomic potential is effectively attractive, a singularity of the solution emerges in a finite time. This phenomenon which we call collapse explains the upper bound for the number of atoms in such condensates under traps.
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KASAMATSU, KENICHI, MAKOTO TSUBOTA, and MASAHITO UEDA. "VORTICES IN MULTICOMPONENT BOSE–EINSTEIN CONDENSATES." International Journal of Modern Physics B 19, no. 11 (April 30, 2005): 1835–904. http://dx.doi.org/10.1142/s0217979205029602.

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We review the topic of quantized vortices in multicomponent Bose–Einstein condensates of dilute atomic gases, with an emphasis on the two-component condensates. First, we review the fundamental structure, stability and dynamics of a single vortex state in a slowly rotating two-component condensates. To understand recent experimental results, we use the coupled Gross–Pitaevskii equations and the generalized nonlinear sigma model. An axisymmetric vortex state, which was observed by the JILA group, can be regarded as a topologically trivial skyrmion in the pseudospin representation. The internal, coherent coupling between the two components breaks the axisymmetry of the vortex state, resulting in a stable vortex molecule (a meron pair). We also mention unconventional vortex states and monopole excitations in a spin-1 Bose–Einstein condensate. Next, we discuss a rich variety of vortex states realized in rapidly rotating two-component Bose–Einstein condensates. We introduce a phase diagram with axes of rotation frequency and the intercomponent coupling strength. This phase diagram reveals unconventional vortex states such as a square lattice, a double-core lattice, vortex stripes and vortex sheets, all of which are in an experimentally accessible parameter regime. The coherent coupling leads to an effective attractive interaction between two components, providing not only a promising candidate to tune the intercomponent interaction to study the rich vortex phases but also a new regime to explore vortex states consisting of vortex molecules characterized by anisotropic vorticity. A recent experiment by the JILA group vindicated the formation of a square vortex lattice in this system.
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Pereira, Lucas Carvalho, and Valter Aragão do Nascimento. "Dynamics of Bose–Einstein Condensates Subject to the Pöschl–Teller Potential through Numerical and Variational Solutions of the Gross–Pitaevskii Equation." Materials 13, no. 10 (May 13, 2020): 2236. http://dx.doi.org/10.3390/ma13102236.

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We present for the first time an approach about Bose–Einstein condensates made up of atoms with attractive interatomic interactions confined to the Pöschl–Teller hyperbolic potential. In this paper, we consider a Bose–Einstein condensate confined in a cigar-shaped, and it was modeled by the mean field equation known as the Gross–Pitaevskii equation. An analytical (variational method) and numerical (two-step Crank–Nicolson) approach is proposed to study the proposed model of interatomic interaction. The solutions of the one-dimensional Gross–Pitaevskii equation obtained in this paper confirmed, from a theoretical point of view, the possibility of the Pöschl–Teller potential to confine Bose–Einstein condensates. The chemical potential as a function of the depth of the Pöschl–Teller potential showed a behavior very similar to the cases of Bose–Einstein condensates and superfluid Fermi gases in optical lattices and optical superlattices. The results presented in this paper can open the way for several applications in atomic and molecular physics, solid state physics, condensed matter physics, and material sciences.
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Alekseev, V. A. "Interference of two Bose-Einstein condensates." Journal of Experimental and Theoretical Physics Letters 69, no. 7 (April 1999): 526–31. http://dx.doi.org/10.1134/1.568062.

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Yoo, Sung Mi, Janne Ruostekoski, and Juha Javanainen. "Interference of two Bose–Einstein condensates." Journal of Modern Optics 44, no. 10 (October 1997): 1763–74. http://dx.doi.org/10.1080/09500349708231845.

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MI YOO JANNE RUOSTEKOSKI and JUHA J, SUNG. "Interference of two Bose-Einstein condensates." Journal of Modern Optics 44, no. 10 (October 1, 1997): 1763–74. http://dx.doi.org/10.1080/095003497152799.

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Dissertations / Theses on the topic "Two Bose-Einstein condensates"

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Sanz, Sánchez Julio. "Two-component Bose-Einstein condensates with competing interactions." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668865.

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This thesis reports the experimental study of two-component Bose-Einstein condensates with tunable interactions, which are exploited as a platform to perform quantum simulation of many-body quantum systems. To perform this experiments, we have implemented an atomic source consisting on a glass cell 2D MOT vacuum chamber and a high resolution optical system to image and manipulate the atoms. Furthermore, we develop and characterize a polarization phase contrast technique which is able to probe optically dense atomic mixtures at intermediate and high magnetic fields in open transitions. This technique has been used to either probe the total column density of a two-component atomic cloud or the difference in column density between both components. We report on the first observation of composite quantum liquid droplets in an incoherent mixture with residual mean field attraction. Strikingly, this novel phase is stabilized due to the repulsive beyond mean field corrections in a weakly interacting system. Moreover, we have characterized the liquid to gas phase transition which occurs for small atom numbers. Additionally, we have compared two different self-bound states in a quasi-1D geometry with incoherent mixtures: quantum droplets and bright solitons. Depending on the atom number and interaction strengths both states can be smoothly connected through a crossover or be distinct entities separated by a transition. We have measured its composition, its phase diagram and mapped out the soliton to droplet transition. Finally, we report on a technique to modify the elastic and inelastic interactions in a two-component Bose-Einstein condensate with very unequal and competing interactions under the presence of strong coherent coupling. This technique provides a wide flexibility and has allowed us to observe bright solitons in quasi-1D in a coherently coupled dressed state. We exploit the fast temporal control of the effective interactions to quench them into the attractive regime and study the resulting modulational instability which develops into a bright soliton train.
Aquesta tesi descriu l'estudi experimental d'una mescla de dos condensats de Bose-Einstein amb interaccions ajustables. Aquest sistema és utilitzat com una plataforma per a estudiar sistemes quàntics formats per moltes partícules a partir de la simulació quàntica. Per a fer aquests experiments, he construït una font atòmica formada per una trampa magneto-òptica en 2D que s'implementa en una cambra de buit feta de vidre. A més a més, he desenvolupat i caracteritzat una tècnica d'imatge de contrast de fase basada en la rotació de la polarització de la llum. Aquesta tècnica està preparada per fer imatges de mescles atòmiques a camps magnètics intermedis i alts amb una gran densitat òptica i amb transicions òptiques obertes. Hem utilitzat la tècnica per a mesurar la densitat integrada total en l'eix òptic així com la diferència entre ambdues components. Es descriu la primera observació de gotes líquides quàntiques compostes per dues components incoherents amb una atracció residual en l'aproximació de camp mitjà. Sorprenentment, aquesta nova fase està estabilitzada a causa de la repulsió generada per les correccions de l'energia més enllà de l'aproximació de camp mitjà en un sistema amb interaccions dèbils. També hem caracteritzat la transició de fase líquid-gas que succeeix quan el sistema té un nombre d'àtoms reduït. A més a més, hem comparat dos estats autoconfinats de diferent natura en una geometria quasi-1D amb una mescla d'àtoms incoherents: les gotes quàntiques i els solitons brillants. Segons el nombre d'àtoms i la força de les interaccions aquests estats poden estar connectats o bé suaument o bé per una transició de fase. Hem mesurat la seva composició, el diagrama de fases i hem traçat el mapa de transició entre solitons i gotes en funció del camp magnètic i nombre d'àtoms. Finalment, es descriu una tècnica per a modificar les interaccions elàstiques i inelàstiques en un condensat de Bose-Einstein format per dues components, amb interaccions diferents i en competició, coherentment acoblades. Aquesta tècnica ens proveeix d'una gran flexibilitat per a modificar les interaccions i ens ha permès observar solitons brillants en quasi-1D en un estat vestit per l'acoblament coherent. Hem utilitzat l'habilitat per a modificar temporalment les interaccions per a canviar-les bruscament cap al règim atractiu i estudiar la inestabilitat dels modes que es manifesta amb la formació d'un tren de solitons brillants.
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Zhang, Bo. "Quantum turbulence in two dimensional Bose-Einstein condensates." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539623584.

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We examine the energy cascades and quantum vortex structures in two-dimensional quantum turbulence through a special unitary time evolution algorithm. An early attempt at using the Lattice Boltzmann Method proved successful in correctly representing some features of the Nonlinear Schrodinger System (NLS), such as the phase shift following the one-dimensional soliton-soliton collision, as well as the two-dimentional modulation instability. However, to accurately evaluate NLS, the implicit Euler method is required to resolve the time evolution, which is computationally expensive. A more accurate and efficient method, the Quantum Lattice Gas model is employed to simulate the quantum turbulence governed by the Gross-Pitaevskii equation, an equaiton that describes the evolution of the ground state wave function for a Bose-Einstein condensate (BEC). It is discovered that when the ratio of the internal energy to the kinetic energy is below 0.05, an unexpected short Poincare recurrence occurs independent of the initial profile of the wave function. It is demonstrated that this short recurrence is destroyed as the internal energy is strengthened. to compare the two-dimensional quantum turbulence with its classical counterpart, the incompressible energy spectra of quantum turbulence is analyzed. However, the result reveals no sign of dual cascades which is a hallmark of the classical incompressible two-dimensional fluid (inverse energy cascade to large scales with a direct cascade of enstrophy to small scales). It is the spectra of the compressible energy that can exhibits multiple cascades, but this is strongly dependent on the initial condition.
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Mason, Peter. "Travelling waves in two-dimensional Bose-Einstein condensates." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611373.

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Farolfi, Arturo. "Spin dynamics in two-component Bose-Einstein condensates." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/299835.

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Bose-Einstein condensates (BECs) of ultra-cold atoms have been subjects of a large research effort, that started a century ago as a purely theoretical subject and is now, since the invention of evaporative cooling thirty years ago, a rich research topic with many experimental apparatuses around the world. A deep knowledge of its underlying physics has been now acquired, for example on the thermodynamics of the gas, superfluidity, topological excitations and many-body physics. However, many topics are still open for investigation, thanks to the flexibility and the high degree of control of these systems. During the course of my PhD, I developed and realized a new experimental apparatus for the realization of coherently-coupled mixtures of sodium BECs. The highly stable and low-noise magnetic environment of this apparatus enables the experimental investigation of a previously inaccessible regime, where the energy of the coupling becomes comparable to the energy of spin excitations of the mixture. With this apparatus, I concluded two experimental investigations: I produced and investigated non-dispersive spin-waves in an two-component BEC and I experimentally observed the quantum spin-torque effect on a elongated bosonic Josephson junction.The research activity in multi-component BECs of alkali atoms begun shortly after the first realization of a condensate, thanks to the low energy splitting between the internal sub-states of the electronic ground state. These internal states can be coherently coupled with an external electromagnetic field and can interact via mutual mean-field interaction, generating interestinc effects such as ground states with different magnetic ordering depending on their interaction constants, density as well as spin dynamics and internal Josephson effects. The research interest on mixtures of sodium atoms sparks from the peculiar characteristic of the system: in the $ket{F = 1, m_F = pm 1}$ states, the interaction constants are such that the ground state has anti-ferromagnetic ordering and the system is perfectly symmetric for exchanges of the two species. In these peculiar system, density- and spin-excitations have very different energetic cost, with the latter being much less energetic, and can be completely decoupled. Moreover, spin-excitations, that are connected to excitations in the relative-phase between the components, change drastically in nature when a coupling of comparable energy is added between the states. The presence of the coupling effectively locks the relative-phase in the bulk and spin excitations become localized. While extensive theoretical predictions on the spin dynamics of this system has been already performed, experimental confirmation was still lacking because of the high sensitivity to external forces (due to the very low energy of the spin excitations) and the impossibility of realizing a low-energy coupling between these states in the presence of environmental magnetic noise. During my PhD, I realized an experimental apparatus where magnetic noises are suppressed by five orders of magnitude using a multi-layer magnetic shield made of an high-permeability metal alloy (μ-metal), that encases the science chamber. In this apparatus, I developed a protocol, compatible with the technical limitations of the magnetic shield, to produce BECs in a spin-insensitive optical trapping potential. I then characterized the residual magnetic noise and found it compatible with the requirements for observing spin-dynamics effects. Finally, I realized a system and a set of protocols for the manipulation of the internal state of the sample allowing arbitrary preparation of the sample while maintaining the long coherence times necessary to observe the spin dynamics, that have been used in the subsequent experimental observations. The first experimental result discussed in this thesis, is the production of magnetic solitons and the observation of their dynamic in a trapped sample. Waves in general spread during their propagation in a medium, however this tendency can be counterbalanced by a self-focusing effect if dispersion of the wave is non-linear, generating non-dispersive and long-lived wavepackets commonly named solitons. These have been found in many fields of physics, such as fluid dynamics, plasma physics, non-linear optics and cold-atoms BECs, attracting interest because of their ability to transport information or energy unaltered over long distances, as they are robust against the interaction with in-homogeneities in the medium. Of these systems, cold-atoms can be widely manipulated to generated different kinds of solitons, both in single and in multi-components systems. A new kind of them, named magnetic solitons, has been predicted in a balanced mixture of BECs of sodium in $ket{F = 1, m_F = pm 1}$, however experimental observation was still lacking. I deterministically produced magnetic solitons via phase engineering of the condensate using a spin-sensitive optical potential. I then developed a tomographic imaging technique to semi-concurrently measure the densities of both components and the discontinuities in their relative phase, allowing for the reconstruction of all the relevant quantities of the spinor wavefunction. This allowed to observe the dispersionless dynamics of the solitons as they perform multiple oscillation in the trapped sample in a timescale of the order of the second. Moreover, I engineered collisions between different kinds of magnetic solitons and observed their robustness to mutual interaction. The second experimental results presented in this thesis is the observation of the breaking of magnetic hetero-structures in BECs due to the quantum spin torque effect, an effect with strong analogies with electronic spins traveling through magnetic devices. Spins in magnetic material precess around the axis of the effective magnetic field, and their dynamics must take into account the external field as well as non-linear magnetization and the inhomogeneity of the material. These effects are commonly described by the Landau-Lifshitz equation and have been mainly studied for electronic spins in magnetic hetero-structures, where the inhomogeneity in the material at the interfaces enhances the exchange effects between spins. For homogeneous materials, this description reduces to the Josephson system, a closely related effect that is more known in cold-atoms systems. The Josephson effect arises when a macroscopic number of interacting bosonic particles are distributed in two possible states, weakly tunnel-coupled together, with the average energy of particles occupying each of the states depending on the occupation number itself. In these conditions, the dynamics of the system depends on the difference in occupation numbers, the relative phase between the states and the self-interaction to tunneling ratio, giving raise to macroscopic quantum effects such as oscillating AC and DC Josephson currents and self-trapping. While these phenomena has been historically studied in junctions between superconducting systems, they can be also realized with cold-atoms systems, allowing the study of Josephson junctions with finite dimensions and in regimes that are hard to reach for superconducting systems. In this thesis, I realized a magnetic hetero-structure in a two-component elongated BECs thanks to the simultaneous presence of self-trapped (ferromagnetic) and oscillating (paramagnetic) regions in the sample. While the dynamics at short times is correctly described by the Josephson effects, at the interface between the regions the particle nature of the gas creates a strong exchange effect, named the quantum spin torque, that produces magnetic excitations that spread trough the sample and break the local Josephson behaviour. I experimentally studied the spread and nature of these magnetic excitations, while numerical simulations confirmed the dominant role played by the quantum spin torque effect. The structure of this thesis is the following: in the first chapter is given a review of theoretical concepts and existing literature. In the second chapter is described the experimental apparatus and the protocols developed to prepare the ultra-cold atoms sample. In the third chapter is presented the experimental observation of magnetic solitons. In the fourth chapter is presented the experimental investigation of the quantum spin torque effect in magnetic heterostructures. The last chapter is devoted to conclusions and outlook of this work.
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Yin, Chen Yun. "Solitary waves in immiscible two-component Bose-Einstein condensates." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608650.

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Pattinson, Robert William. "Two-component Bose-Einstein condensates : equilibria and dynamics at zero temperature and beyond." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2509.

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In this Thesis we study steady state solutions and dynamical evolutions of two– component atomic Bose–Einstein Condensates. We initially investigate the equilibrium properties of condensate mixtures in harmonic trapping potentials at zero temperature. Subsequently we simulate the coupled growth of these condensates by inclusion of damping terms. Finally, we investigate the evolution of coupled Bose gases via the so-called classical–field method. A recent experiment [D. J. McCarron et al., Phys. Rev. A, 84, 011603(R) (2011)] achieved Bose–Einstein Condensation of a two–species 87Rb–133Cs phase segregated mixture in harmonic trapping potentials. Depending on relative atom numbers of the two species, three distinct regimes of density distributions were observed. For these experimental parameters, we investigate the corresponding time–independent ground state solutions through numerical simulations of the coupled Gross–Pitaevskii equations. By including experimentally relevant shifts between the traps, we observe a range of structures including ‘ball and shell’ formations and axially/radially separated states. These are found to be very sensitive to the trap shifts. For all three experimental regimes, our numerical simulations reveal good qualitative agreement. The observed experimental profiles cannot be guaranteed to be fully equilibrated. This, coupled with the rapid sympathetic cooling of the experimental system, leads to a situation where growth may play a determining factor in the density structures formed. To investigate this further, we introduce phenomenological damping to describe the associated condensate growth/decay, revealing a range of transient structures. However, such a model always predicts the predominance of one condensate species over longer evolution times. Work undertaken by collaborators with the more elaborate Stochastic Projected Gross–Pitaevskii equations, which can describe condensate formation by coupling to a heat bath, predicts the spontaneous formation of dark–bright solitons. Motivated by this, we show how the presence of solitons can affect the condensate distribution, thus highlighting the overall dynamical role in the emerging patterns. Finally, we use classical field methods to analyse the evolution of non trapped Bose gases from strongly nonequilibrium initial distributions. The contrast between miscible (overlapping) and immiscible (phase segregated) components gives rise to important distinctions for condensate fractions and the formation of domains and vortices. In addition, splitting the particles of a single component thermalised state into two components is investigated. We then study the effects of suddenly quenching the strength of the interspecies interactions. Under suitable conditions, this quench generates isotropic vortex tangles. While this tangle subsequently decays over time, we propose how a repeat sequence of quenches at regular intervals could be employed to drive the tangle, thereby potentially providing a novel route to the generation of quantum turbulence.
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Hartmann, Timo [Verfasser], and Klaus [Akademischer Betreuer] Richter. "Transport of Bose-Einstein condensates through two dimensional cavities / Timo Hartmann. Betreuer: Klaus Richter." Regensburg : Universitätsbibliothek Regensburg, 2014. http://d-nb.info/1070423513/34.

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Wilson, Kali Elena. "Developing a Toolkit for Experimental Studies of Two-Dimensional Quantum Turbulence in Bose-Einstein Condensates." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/577309.

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Bose-Einstein condensates (BECs), with their superfluid behavior, quantized vortices, and high-level of control over trap geometry and other system parameters provide a compelling environment for studies of quantum fluid dynamics. Recently there has been an influx of theoretical and numerical progress in understanding the superfluid dynamics associated with two-dimensional quantum turbulence, with expectations that complementary experiments will soon be realized. In this dissertation I present progress in the development of an experimental toolkit that will enable such experimental studies of two-dimensional quantum turbulence. My approach to developing this toolkit has been twofold: first, efforts aimed at the development of experimental techniques for generating large disordered vortex distributions within a BEC; and second, efforts directed towards the design, implementation, and characterization of a quantum vortex microscope. Quantum turbulence in a superfluid is generally regarded as a disordered tangle of quantized vortices in three dimensions, or a disordered planar distribution of quantized vortices in two dimensions. However, not all vortex distributions, even large disordered ones, are expected to exhibit robust signatures of quantum turbulence. Identification and development of techniques for controlled forcing or initialization of turbulent vortex distributions is now underway. In this dissertation, I will discuss experimental techniques that were examined during the course of my dissertation research, namely generation of large disordered distributions of vortices, and progress towards injecting clusters of vortices into a BEC. Complimentary to vortex generation is the need to image these vortex distributions. The nondeterministic nature of quantum turbulence and other far-from-equilibrium superfluid dynamics requires the development of new imaging techniques that allow one to obtain information about vortex dynamics from a single BEC. To this end, the first vortex microscope constructed as part of my dissertation research enabled the first in situ images of quantized vortices in a single-component BEC, obtained without prior expansion. I have further developed and characterized a second vortex microscope, which has enabled the acquisition of multiple in situ images of a lattice of vortex cores, as well as the acquisition of single in situ images of vortex cores in a BEC confined in a weak hybrid trap. In this dissertation, I will discuss the state-of-the-art of imaging vortices and other superfluid phenomena in the University of Arizona BEC lab, as indicated by the examined performance of the quantum vortex microscope.
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Barreto, Diogo Lima. "Campos de calibre artificiais em condensados de Bose-Einstein." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-16042015-103959/.

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Nesta dissertação nós revisamos a teoria básica que descreve a junção Josephson bosônica para uma e duas espécies partindo do modelo de Bose-Hubbard. Em seguida explicamos como é possível gerar campos de calibe artificiais em um sistema de átomos neutros, como é o caso do condensado de Bose-Einstein. Finalmente, utilizando os conhecimentos teóricos desenvolvidos anteriormente nós buscamos os estados estacionários de um sistema de pseudospin 1/2 submetido a um campo de calibre não-Abeliano artificial, que torna a dinâmica da junção muito mais complexa e rica. Nós também exploramos um novo desbalanceamento de população que surge no sistema, devido a presença do campo de calibre, com características similares as do Macroscopic Quantum Self-Trapping.
In this dissertation we review the basic theory that describes the bosonic Josephson junction for one and two species using the Bose-Hubbard model. Afterwards, we explain how it is possible to generate artificial gauge fields for neutral atoms, like a Bose-Einstein condensate. Finally, using this theoretical background we search for stationary states of a pseudospin 1/2 system subject to a non-Abelian artificial gauge field which turns the dynamic of the junction much more complex and rich. We also explore a possible new populational imbalance that appears on the system due to the presence of the gauge field, with similar features as the Macroscopic Quantum Self-Trapping.
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Prandini, Renata Benedicto. "Dinâmica de dois condensados de Bose-Einstein - Tratamento de campo médio." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-18022014-161316/.

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Investigamos o sistema formado por dois condensados aprisionados em estados hiperfinos diferentes do Rubídio, num potencial em forma de charuto, ou seja, num sistema físico real e quase-unidimensional. É investigada a dependência das soluções das equações de Gross-Pitaevski com a separação entre as armadilhas, bem como com o parâmetro de acoplamento de Josephson, para três valores diferentes do número total de átomos aprisionados. Para alguns conjuntos de parâmetros constatamos a existência de estados metaestáveis. O observável que escolhemos para caracterizar tal sistema físico foi a separação média entre os pacotes, pois os dois ramos de soluções encontramos correspondem a soluções mais juntas ou mais separadas espacialmente.
We study the system formed by two coupled condensates of different Rubidium hyperfine states trapped in a cigar shaped potential, that is, a real quasi one-dimensional system. The dependency of the solution of the Gross-Pitaevski equations is investigated as a function of trap displacement and Josephson coupling parameter for three different values of the total trapped atoms number. For some sets of parameters we report the existence of metastable states. The observable we chose to characterize this system was the mean separation between the packages, because we found two branches which correspond to closer or more separated solutions.
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Books on the topic "Two Bose-Einstein condensates"

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Chen, Ruey-Lin. Experimental Individuation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190636814.003.0009.

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This chapter examines the problem of individuation from the perspective of experimental practices. In previous work, the author suggests a conception of experimental individuality (defined by separability, manipulability, and maintainability of structural unity) extracted from experimental individuation whose process and conditions in turn are the topic of this chapter. The author identifies the creation of individuals in experimenting as the ontological mode of experimental individuation and the presentation of individuals as the epistemological mode. Three experimental cases (the creation of Bose-Einstein condensates and fermionic condensates and the presentation of individual genes) are examined to explain the two modes. The author argues that effective experimental mechanisms and operative conditions for maintaining the structural unity of experimented entities when those entities are separated and manipulated occur in both modes of experimental individuation.
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Morawetz, Klaus. Systems with Condensates and Pairing. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0012.

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The Bose–Einstein condensation and appearance of superfluidity and superconductivity are introduced from basic phenomena. A systematic theory based on the asymmetric expansion of chapter 11 is shown to correct the T-matrix from unphysical multiple-scattering events. The resulting generalised Soven scheme provides the Beliaev equations for Boson’s and the Nambu–Gorkov equations for fermions without the usage of anomalous and non-conserving propagators. This systematic theory allows calculating the fluctuations above and below the critical parameters. Gap equations and Bogoliubov–DeGennes equations are derived from this theory. Interacting Bose systems with finite temperatures are discussed with successively better approximations ranging from Bogoliubov and Popov up to corrected T-matrices. For superconductivity, the asymmetric theory leading to the corrected T-matrix allows for establishing the stability of the condensate and decides correctly about the pair-breaking mechanisms in contrast to conventional approaches. The relation between the correlated density from nonlocal kinetic theory and the density of Cooper pairs is shown.
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Kavokin, Alexey V., Jeremy J. Baumberg, Guillaume Malpuech, and Fabrice P. Laussy. Strong Coupling: Polariton Bose Condensation. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198782995.003.0008.

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In this Chapter we address the physics of Bose-Einstein condensation and its implications to a driven-dissipative system such as the polariton laser. We discuss the dynamics of exciton-polaritons non-resonantly pumped within a microcavity in the strong coupling regime. It is shown how the stimulated scattering of exciton-polaritons leads to formation of bosonic condensates that may be stable at elevated temperatures, including room temperature.
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Book chapters on the topic "Two Bose-Einstein condensates"

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Tanatar, B. "Different Scattering Regimes in Two-Dimensional Bose-Einstein Condensates." In Quantum Communication and Information Technologies, 329–38. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0171-7_14.

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Sørensen, O., D. V. Fedorov, and A. S. Jensen. "Two-Body Correlations and the Structure of Bose-Einstein Condensates." In Few-Body Problems in Physics ’02, 373–76. Vienna: Springer Vienna, 2003. http://dx.doi.org/10.1007/978-3-7091-6728-1_87.

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Groß, Christian. "Squeezing Two Mean Field Modes of a Bose–Einstein Condensate." In Spin Squeezing and Non-linear Atom Interferometry with Bose-Einstein Condensates, 25–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25637-0_3.

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Liu, Wu-Ming, and Emmanuel Kengne. "Inhomogeneous Nonlinear Schrödinger Equations of Bose–Einstein Condensates with Two-Body Interactions." In Schrödinger Equations in Nonlinear Systems, 193–263. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6581-2_6.

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Modugno, M., C. Fort, F. Minardi, M. Inguscio, and F. Dalfovo. "Experiments with two Colliding Bose-Einstein Condensates in an Elongated Magneto-Static Trap." In Trapped Particles and Fundamental Physics, 67–90. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0440-4_4.

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Sizhuk, Andrii S., Anatoly A. Svidzinsky, and Marlan O. Scully. "Fluctuations in Two Component Interacting Bose–Einstein Condensate." In Classical, Semi-classical and Quantum Noise, 235–48. New York, NY: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4419-6624-7_16.

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Kundu, N., and Utpal Roy. "Two Component Bose–Einstein Condensate in a Pöschl–Teller Potential." In Springer Proceedings in Physics, 130–36. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9969-5_12.

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Rodríguez-Lara, B. M., and R. K. Lee. "Classical Dynamics of a Two-species Bose-Einstein Condensate in the Presence of Nonlinear Maser Processes." In Progress in Optical Science and Photonics, 531–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/10091_2012_7.

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"Vortices in two-dimensional Bose-Einstein condensates." In Geometry and Nonlinear Partial Differential Equations, 87–114. Providence, Rhode Island: American Mathematical Society, 2002. http://dx.doi.org/10.1090/amsip/029/10.

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Myatt, C. J., E. A. Burt, R. W. Ghrist, E. A. Cornell, and C. E. Wieman. "Production of Two Overlapping Bose-Einstein Condensates by Sympathetic Cooling." In Collected Papers of Carl Wieman, 489–92. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812813787_0066.

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Conference papers on the topic "Two Bose-Einstein condensates"

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Anderson, Brian P., T. W. Neely, A. S. Bradley, E. C. Samson, S. J. Rooney, E. M. Wright, K. J. H. Law, R. Carretero-González, P. G. Kevrekidis, and M. J. Davis. "Two-Dimensional Quantum Turbulence in Bose-Einstein Condensates." In International Quantum Electronics Conference. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/iqec.2011.i1171.

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Anderson, Brian P., T. W. Neely, A. S. Bradley, E. C. Samson, S. J. Rooney, E. M. Wright, K. J. H. Law, R. Carretero-Gonzalez, P. G. Kevrekidis, and M. J. Davis. "Two-dimensional quantum turbulence in Bose-Einstein condensates." In 2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim. IEEE, 2011. http://dx.doi.org/10.1109/iqec-cleo.2011.6194168.

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RINDLER-DALLER, T. "VORTICES IN TWO-DIMENSIONAL ROTATING BOSE-EINSTEIN CONDENSATES." In Proceedings of the Workshop. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812778901_0035.

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Pyrkov, Alexey N., and Tim Byrnes. "Quantum information processing with macroscopic two-component Bose-Einstein condensates." In The International Conference on Micro- and Nano-Electronics 2018, edited by Vladimir F. Lukichev and Konstantin V. Rudenko. SPIE, 2019. http://dx.doi.org/10.1117/12.2522432.

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Lee, Chaohong, Libin Fu, and Yuri S. Kivshar. "Quantum and thermal decoherence in two weakly coupled Bose-Einstein condensates." In Quantum-Atom Optics Downunder. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/qao.2007.qme8.

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Anderson, R., B. V. Hall, P. Hannaford, and A. Sidorov. "Coherence of Two-Component Bose-Einstein Condensates on an Atom Chip." In Quantum-Atom Optics Downunder. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/qao.2007.qme9.

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Vahala, George, Jeffrey Yepez, and Linda Vahala. "Low-order qubit representation for two coupled Bose-Einstein condensates (BEC)." In Defense and Security Symposium, edited by Eric J. Donkor, Andrew R. Pirich, and Howard E. Brandt. SPIE, 2006. http://dx.doi.org/10.1117/12.665333.

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Kuwamoto, T., K. Araki, K. Hamazaki, M. Iwata, and T. Hirano. "Optical confinement of two-component Bose-Einstein condensates of /sup 87/Rb." In International Quantum Electronics Conference, 2005. IEEE, 2005. http://dx.doi.org/10.1109/iqec.2005.1561139.

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Takahashi, Junichi, Yuto Hayaki, and Yoshiya Yamanaka. "Quantum fluctuations of zero-modes for trapped two-component Bose–Einstein condensates." In PROCEEDINGS OF THE 14TH ASIA-PACIFIC PHYSICS CONFERENCE. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0037070.

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Baizakov, B. B., M. Salerno, and V. V. Konotop. "Modulational instability of Bose-Einstein condensates in two- and three-dimensional optical lattices." In Nonlinear Guided Waves and Their Applications. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/nlgw.2002.nlmd2.

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Reports on the topic "Two Bose-Einstein condensates"

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Collins, Lee A., and Christopher Ticknor. Phase Transitions in Miscible Two-Component Bose-Einstein Condensates. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1188149.

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