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Dissertations / Theses on the topic 'Bose condensate'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Mashayekhi, Mohammadsadegh. "Splitting a Bose condensate." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12647.

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The primary goal of this thesis is to find the distribution function of number of particles imbalance for ultra cold bosons trapped in a double well potential elongated in one direction for different strength of interaction between particles. This distribution function has been found to be Gaussian distribution function in two different limits. The first limit is weak interaction limit, where we only consider one energy level per well that is called "two mode approximation" regime. The second limit is when the interaction energy is in the same order as gap between energy levels where in this c

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2

Palacios, Álvarez Silvana. "Single domain spinor Bose-Einstein condensate." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/458123.

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This work reports on the construction of a new-generation system capable to create single-mode spinor Bose-Einstein condensates of 87Rb, and non-destructively probe them using optical Faraday rotation. This system brings together many of the stateof-the-art technologies in ultra-cold physics in a minimalist design which was possible due to the prolific advances in the field respect to the pioneering experiments (Cornell's, Ketterle's, and Chapman's groups). There is rich phenomena that can be potentially studied in this system from the study of predicted novel quantum phases and topologies to

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3

Zawadzki, Mateusz. "Bose-Einstein condensate manipulation and interferometry." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=12801.

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4

Floegel, Filip. "Optical loading of a Bose-Einstein condensate." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970681119.

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5

Leblanc, Pierre J. "Optical probing of a Bose-Einstein condensate." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26508.

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Experimental results acquired with various methods used to optically probe an excitonic Bose-Einstein condensate are presented. The condensate is initially created by a high-intensity pulsed laser illumination (lambda = 532 nm) incident on a high-quality natural single crystal of Cu2O (at T = 1.8 K), having (100) symmetry. The travelling condensate is laterally probed by a laser pulse tuned at the 1S orthoexciton resonance (lambda = 609.51 nm), where significant condensate amplification is observed. Correspondingly, the resonant probing beam is additionally attenuated upon being transmitted th

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6

Palzer, Stefan. "Single impurities in a Bose-Einstein condensate." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609015.

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7

Cavicchioli, Luca. "Image enhancement for a Bose-Einstein condensate interferometer." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21719/.

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The atom, thanks to its wave behaviour, can manifest phenomena which are, usually, associated to light: interference is one of them. The possibility of cooling atomic clouds and manipulating the states of the atoms contained in them opened many new opportunities to exploit these states in many ways; one of them is measuring various kinds of physical observables with high precision, thanks to the aforementioned interference phenomena: this is atom interferometry. Since the first Bose-Einstein condensates in atomic gases were obtained, there has been a keen interest in interference between t

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8

Ilo-Okeke, Ebubechukwu Odidika. "Guided-wave atom interferometers with Bose-Einstein condensate." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/155.

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An atom interferometer is a sensitive device that has potential for many useful applications. Atoms are sensitive to electromagnetic fields due to their electric and magnetic moments and their mass allows them to be deflected in a gravitational field, thereby making them attractive for measuring inertial forces. The narrow momentum distribution of Bose-Einstein condensate (BEC) is a great asset in realizing portable atom interferometers. An example is a guided-wave atom interferometer that uses a confining potential to guide the motion of the condensate. Despite the promise of guided-wave atom

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9

West, Tristan. "Quantum dot dynamics in a Bose-Einstein condensate." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23993.

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This thesis investigates the dynamics of an atomic quantum dot (AQD) coupled to a Bose-Einstein condensate (BEC) via particle exchange and interactions. This is motivated by the possibility of using such a system as a non-destructive probe of the BEC. A review of the physics of a BEC and relevant impurity models is presented. The collisional blockade regime of the AQD is considered, and the AQD is modelled as a spin-1/2 pseudospin. Having expressed the BEC in terms of number and phase, the semi-classical ground state of the system is determined. The fluctuations in number and phase around this

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10

Harutinian, Jorge Amin Seman. "Study of excitations in a Bose-Einstein condensate." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-24102011-140439/.

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In this work we study a Bose-Einstein condensate of 87Rb under the effects of an oscillatory excitation. The condensate is produced through forced evaporative cooling by radio-frequency in a harmonic magnetic trap. The excitation is generated by an oscillatory quadrupole field superimposed on the trapping potential. For a fixed value of the frequency of the excitation we observe the production of different regimes in the condensate as a function of two parameters of the excitation: the time and the amplitude. For the lowest values of these parameters we observe a bending of the main axis of th

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11

Landini, Manuele. "A tunable Bose-Einstein condensate for quantum interferometry." Doctoral thesis, Università degli studi di Trento, 2012. https://hdl.handle.net/11572/368380.

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The subject of this thesis is the use of BECs for atom interferometry. The standard way atom interferometry is today performed is by interrogating free falling samples of atoms. The employed samples are cold (but not condensed) to have high coherence, and dilute, not to interact significantly with each other. This technique represents nowadays an almost mature field of research in which the achievable interferometric sensitivity is bounded by the atomic shot noise. Until a few years ago the employment of BECs in such devices was strongly limited by the effect of the interactions between the co

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12

Landini, Manuele. "A tunable Bose-Einstein condensate for quantum interferometry." Doctoral thesis, University of Trento, 2012. http://eprints-phd.biblio.unitn.it/801/1/tesidott.pdf.

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The subject of this thesis is the use of BECs for atom interferometry. The standard way atom interferometry is today performed is by interrogating free falling samples of atoms. The employed samples are cold (but not condensed) to have high coherence, and dilute, not to interact significantly with each other. This technique represents nowadays an almost mature field of research in which the achievable interferometric sensitivity is bounded by the atomic shot noise. Until a few years ago the employment of BECs in such devices was strongly limited by the effect of the interactions between the co

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13

Chikkatur, Ananth P. 1975. "Colliding and moving Bose-Einstein condensates : studies of superfluidity and optical tweezers for condensate transport." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16907.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, February 2003.<br>Includes bibliographical references (p. 173-184).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>In this thesis, two different sets of experiments are described. The first is an exploration of the microscopic superfluidity of dilute gaseous Bose-Einstein condensates. The second set of experiments were performed using transported condensates in a new BEC apparatus. Superfluidity was probed by moving

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14

Hunger, David. "A Bose-Einstein condensate coupled to a micromechanical oscillator." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-115349.

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15

Zipkes, Christoph. "A trapped single ion inside a Bose-Einstein condensate." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/241264.

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In recent years, improved control of the motional and internal quantum states of ultracold neutral atoms and ions has opened intriguing possibilities for quantum simulation and quantum computation. Many-body effects have been explored with hundreds of thousands of quantum-degenerate neutral atoms and coherent light-matter interfaces have been built. Systems of single or a few trapped ions have been used to demonstrate universal quantum computing algorithms and to detect variations of fundamental constants in precision atomic clocks. Now in our experiment we investigate how the two systems can

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16

Schelle, Alexej. "Environment-induced dynamics in a dilute Bose-Einstein condensate." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00438496.

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We directly model the quantum many particle dynamics during the transition of a gas of N indistinguishable bosons into a Bose-Einstein condensate. To this end, we develop a quantitative quantum master equation theory, which takes into account two body interaction processes, and in particular describes the particle number fluctuations characteristic for the Bose-Einstein phase transition. Within the Markovian dynamics assumption, we analytically prove and numerically verify the Boltzmann ergodicity conjecture for a dilute, weakly interacting Bose-Einstein condensate. The new physical bottom lin

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17

MacCormick, Calum. "Coherent atom optics with a dilute Bose-Einstein condensate." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289230.

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18

Arnold, Aidan. "Preparation and manipulation of an '8'7Rb Bose-Einstein condensate." Thesis, University of Sussex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299951.

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19

Wynar, Roahn Helden. "Ultra-cold molecules in an atomic Bose-Einstein condensate /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004403.

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20

Pyle, Andrew James. "Scattering a Bose-Einstein Condensate Off a Modulated Barrier." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1563898921.

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A quantum pump is a device that transports particles through a circuit with localized time-varying potentials, and without the need for an external applied voltage or chemical potential. Quantum pumping was originally proposed in the context of electron transport in nanowires, but has proven difficult to implement. The ultracold atom approach represents a possible route around the current experimental bottleneck. We present an experiment to study 1D quantum mechanical scattering by an amplitude-modulated barrier. This experiment represents a first step toward implementing a quantum pump for ul

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21

Smaira, André de Freitas. "Dinâmica de um condensado de Bose-Eintein contendo sólitons." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-02042015-170017/.

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Condensados de Bose-Einstein (BEC) são sistemas macroscópicos excelentes para a observação do comportamento quântico da matéria. Desde sua obtenção experimental em gases atômicos alcalinos diluídos aprisionados por campos magnéticos, há importantes aspectos relacionados a esse sistema que foram intensamente explorados, como os modos coletivos do BEC harmonicamente aprisionado, seu tunelamento através de barreiras de potencial e os estados excitados desse sistema, incluindo vórtice e sóliton. O último consiste de pacote de onda localizado, que propaga sem mudança de forma. Nesse trabalho, inves

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22

Stickney, James Arthur. "A theoretical analysis of Bose-Einstein condensate based beamsplitters, interferometers, and transistors." Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-032708-124639/.

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23

Chang, Ming-Shien. "Coherent Spin Dynamics of a Spin-1 Bose-Einstein Condensate." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10547.

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Bose-Einstein condensation (BEC) is a phenomenon in which identical bosons occupy the same quantum state below a certain critical temperature. A hallmark of BEC is the coherence between particles every particle shares the same quantum wavefunction and phase. This coherence has been demonstrated for the external (motional) degrees of freedom of the atomic condensates by interfering two condensates. In this thesis, the coherence is shown to extend to the internal spin degrees of freedom of a spin-1 Bose gas evidenced by the observed coherent and reversible spin-changing collisions. The obser

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24

Bookjans, Eva M. "Relative number squeezing in a Spin-1 Bose-Einstein condensate." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37148.

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The quantum properties of matter waves, in particular quantum correlations and entanglement are an important frontier in atom optics with applications in quantum metrology and quantum information. In this thesis, we report the first observation of sub-Poissonian fluctuations in the magnetization of a spinor 87Rb condensate. The fluctuations in the magnetization are reduced up to 10 dB below the classical shot noise limit. This relative number squeezing is indicative of the predicted pair-correlations in a spinor condensate and lay the foundation for future experiments involving spin-squeezing

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25

Hamley, Christopher David. "Spin-nematic squeezing in a spin-1 Bose-Einstein condensate." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47523.

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The primary study of this thesis is spin-nematic squeezing in a spin-1 condensate. The measurement of spin-nematic squeezing builds on the success of previous experiments of spin-mixing together with advances in low noise atom counting. The major contributions of this thesis are linking theoretical models to experimental results and the development of the intuition and tools to address the squeezed subspaces. Understanding how spin-nematic squeezing is generated and how to measure it has required a review of several theoretical models of spin-mixing as well as extending these existing mo

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26

Marshall, Richard John. "Semi classical description of a finite temperature Bose Einstein condensate." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249508.

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27

Kafle, Rudra Prasad. "Theoretical Study of Bose-Einstein Condensate-Based Atom Michelson Interferometers." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/184.

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Atom interferometers and gyroscopes are highly sensitive atom-optical devices which are capable to measure inertial, gravitational, electric, and magnetic fields and to sense rotations. Theoretically, the signal-to-noise ratio of atomic gyroscopes is about a hundred billion times more than that of their optical counterparts for the same particle flux and the enclosed area. Ultra cold atoms from a Bose-Einstein condensate (BEC) can easily be controlled and coherently manipulated on small chips by laser pulses. Atom-optical devices will therefore play a significant role in fundamental research,

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28

Anquez, Martin. "Kibble-Zurek mechanism in a spin-1 Bose-Einstein condensate." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54385.

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The Kibble-Zurek mechanism (KZM) primarily characterizes scaling in the formation of topological defects when a system crosses a continuous phase transition. The KZM was first used to study the evolution of the early universe, describing the topology of cosmic domains and strings as the symmetry-breaking phase transitions acted on the vacuum fields during the initial cooling. A ferromagnetic spin-1 $^{87}$Rb Bose-Einstein condensate (BEC) exhibits a second-order gapless quantum phase transition due to a competition between the magnetic and collisional spin interaction energies. Unlike extende

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29

Shiozaki, Rodrigo Figueiredo. "Quantum turbulence and thermodynamics on a trapped Bose-Einstein condensate." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-12022014-092540/.

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In this thesis we have basically studied two aspects of BoseEinstein condensation (BEC) in trapped dilute gases: (i) superfluidity with the possible onset of quantum turbulence (QT), and (ii) nonuniformity, which suggests the definition of new variables in order to build a global thermodynamic description. Both analyses were performed in a 87Rb BEC magnetically trapped in a QuadrupoleIoffe configuration (QUIC) trap. Concerning the first item, vortices and QT were generated by applying an oscillatory excitation formed by a quadrupole magnetic field superimposed onto the QUIC trapping potential.

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30

Ivory, Megan K. "Experimental Apparatus for Quantum Pumping with a Bose-Einstein Condensate." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1593092109.

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31

Li, Wei. "Quantum dynamics of bose-einstein condensate in 1D optical lattice /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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32

Henkel, Nils. "Rydberg-dressed Bose-Einstein condensates." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-130499.

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My dissertation treats the physics of ultracold gases, in particular of Bose-Einstein condensates with long-ranged interactions induced by admixing a small fraction of a Rydberg state to the atomic ground state. The resulting interaction leads to the emergence of supersolid states and to the self-trapping of a Bose-Einstein condensate.

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33

Karhu, Robin. "Targeted Energy Transfer in Bose-Einstein Condensates." Thesis, Linköpings universitet, Teoretisk Fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98279.

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Targeted Energy Transfer is a resonance phenomenon in coupled anharmonic oscillators. In this thesis we investigate if the concept of Targeted Energy Transfer is applicable to Bose-Einsteain condensates in optical lattices. The model used to describe Bose-Einstein condensates in optical lattices is based on the Gross-Pitaevskii equation. Targeted Energy Transfer in these systems would correspond to energy being transferred from one lattice site to another. We also try to expand the concept of Targeted Energy Transfer to a system consisting of three sites, where one of the sites are considered

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34

Chiquillo, Márquez Emerson Evaristo [UNESP]. "Bright solitons in a quasi-one-dimensional dipolar Bose-Einstein condensate." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/108899.

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Made available in DSpace on 2014-08-27T14:36:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-02-26Bitstream added on 2014-08-27T15:57:04Z : No. of bitstreams: 1 000781512.pdf: 7049961 bytes, checksum: 5670d7d0c2e14f1533ef292642ea6f6d (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Os gases atômicos ultrafrios têm proporcionado um importante ambiente no estudo de sistemas quânticos de muitas partículas nas duas últimas décadas. Em 2005, a realização experimental dum condensado de Bose-Einstein de 'INTPOT. 52 Cr' com interação magnética dipolo dipolo i

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35

Balewski, Jonathan B. [Verfasser]. "A single electron in a Bose-Einstein condensate / Jonathan B. Balewski." München : Verlag Dr. Hut, 2014. http://d-nb.info/1050331826/34.

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36

Parke, Matthew Ian. "Lowest Landau level vortex phenomena in an elliptical Bose-Einstein condensate." Thesis, University of Birmingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433699.

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37

Nolli, Raffaele. "Rubidium 87 Bose Einstein condensate in a driven 1D optical lattice." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10040709/.

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The long term aim of the work is to study non-equilibrium and symmetry-breaking phenomena for a Bose-Einstein condensate in time-dependent optical traps. The work presented in this thesis is mostly devoted to the design, construction and testing of the apparatus, in which condensation was successfully achieved. The first part of this thesis describes the design and construction of a hybrid setup for the production of a Bose-Einstein condensate (BEC) of 87 Rb in the |F = 2, m F = +2 > state. The vacuum system is composed of a first chamber, where a low-velocity intense source (LVIS) of atoms is

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38

Moss, Stephen C. (Stephen Calvin) 1974. "Formation and decay of a Bose-Einstein condensate in atomic hydrogen." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8489.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002.<br>Includes bibliographical references (p. 251-264).<br>The formation and decay of a Bose-Einstein condensate (BEC) in atomic hydrogen is studied. Magnetically trapped hydrogen atoms were evaporatively cooled close to the onset of Bose-Einstein condensation and then suddenly quenched below the transition temperature. The subsequent condensate formation and decay were observed using time-resolved laser spectroscopy of the two-photon S - 2S transition. Theory is developed to quantitatively describe the formation and d

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39

Ramos, Edmir Ravazzi Franco. "Oscillatory interaction in a Bose-Einstein condensate: collective and topological excitations." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-28052012-152412/.

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In this work, we theoretically analyze the behavior of a Bose-Einstein condensate when it is submitted to oscillatory interactions. For that, a homogeneous magnetic field is applied, tuned near a Feshbach resonance, and then it is set to oscillate in time. This variation of the magnetic field causes a scattering length oscillation, which oscillates to interatomic interaction. Thus, we study collective and topological excitations due this oscillation in the interaction. In addition, we have seen a coupling between collective modes as well a dynamical phase transition associated to topological e

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40

Chiquillo, Márquez Emerson Evaristo. "Bright solitons in a quasi-one-dimensional dipolar Bose-Einstein condensate /." São Paulo, 2014. http://hdl.handle.net/11449/108899.

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Orientador: Sadhan Kumar Adhikari<br>Banca: Arnaldo Gammal<br>Banca: Lauro Tomio<br>Resumo: Os gases atômicos ultrafrios têm proporcionado um importante ambiente no estudo de sistemas quânticos de muitas partículas nas duas últimas décadas. Em 2005, a realização experimental dum condensado de Bose-Einstein de 'INTPOT. 52 Cr' com interação magnética dipolo dipolo inter-atômica abriu a porta para um novo nível na pesquisa de gases quânticos degenerados. Ao contrário da interacção de contacto, esta nova interação é de longo alcance e anisotrópica sendo em parte repulsiva ou atrativa. Na aproximaç

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Gondret, Victor. "On the entanglement of quasi-particles in a Bose-Einstein Condensate." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP005.

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Ce mémoire de thèse traite de la non-séparabilité de paires de quasi-particules excitées par résonance paramétrique. Le dispositif expérimental utilisé pendant cette thèse permet de produire un condensat de Bose-Einstein d'hélium métastable. L'utilisation d'un gaz d'atomes ultra-froid permet d'atteindre des températures suffisamment basses afin de pouvoir observer des phénomènes intrinsèquement quantiques : la non-séparabilité de l'état. Dans ce travail, nous utilisons le condensat comme un réservoir cohérent permettant de peupler deux modes d'impulsions. L'avantage de l'hélium métastable est

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42

Caracanhas, Mônica Andrioli. "Interações em condensados de Bose-Einstein: temperatura finita e gás dipolar." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-23042010-100355/.

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Neste trabalho investigamos os efeitos das interações na expansão de um condensado de átomos de Rb. Dois problemas são abordados: o efeito de temperatura finita e as alterações introduzidas pela interação dipolar. No primeiro caso, dados experimentais não puderam ser explicados por meio da aproximação de Thomas-Fermi (TF) no regime de T = 0. Num condensado de cerca de 1 - 2 x 105 átomos condensados, o desvio da aproximação de TF ocorreu pelo fato de termos desconsiderado a interação dos átomos térmicos com os do condensado. Elaboramos um modelo teórico, baseado em modelos existentes de temper

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43

Orozco, Arnol Daniel Garcia. "Efeito da turbulência quântica na expansão livre de um superfluido atômico." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-02102018-100959/.

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Neste trabalho, estudamos o efeito da turbulência quântica na expansão livre do condensado de Bose-Einstein de 87Rb. O BEC é produzido em uma armadilha magnética tipo QUIC, em seguida o condensado é perturbado através da aplicação de um campo magnético. A superposição de campos magnéticos excita os modos coletivos em condições de baixa amplitude de excitação. No entanto para altas amplitudes de excitação, foi possível observar também outros efeitos, tais como: a variação do perfil de densidade e a diminuição na taxa de expansão dos átomos. A distribuição de momento dos átomos perturbados, indi

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44

Isella, Lorenzo. "Quantum dynamics of a Bose-Einstein condensate in a 1D optical lattice." Thesis, University of Hertfordshire, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421272.

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45

Yuen, Benjamin. "Production and oscillations of a Bose Einstein condensate on an atom chip." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/18833.

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This thesis describes production of and experiments with a Bose-Einstein condensate of approximately 2 × 10[superscript 4] [superscript 87]Rb atoms, trapped at the surface of an atom chip. In the first half of this thesis I describe the process of trapping and cooling the atomic vapour close to the surface of an atom chip. This process, which cools the vapour by over 9 orders of magnitude, involves a highly complex sequence of events which I implemented and optimised over the first two years of my PhD. In the early stages of this process, the atomic vapour is laser cooled and magneto-optically

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46

Barr, Iain. "Investigating the dynamics of a Bose Einstein condensate on an atom chip." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/26226.

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In this thesis I discuss work that has been carried out on the dynamics of a Bose Einstein condensate of Rb 87 produced near an atom chip. A Bose Einstein Condensate (BEC) is a quantum state of matter where a single quantum state becomes occupied by a macroscopic number of identical Bosons. In our case this is achieved by cooling a system of trapped identical rubidium 87 atoms to its ground state. To reach temperatures of condensation we initially laser cool atoms from room temperature, before loading them into a magnetic trap. The magnetic trap is produced through a combination of uniform mag

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Fava, Eleonora. "Static and dynamics properties of a miscible two-component Bose-Einstein condensate." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/367722.

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One of the main reasons which makes Bose-Einstein condensates a successful topic of research is their ï¬‚exibility for creating systems whose Hamiltonian can be engineered almost at will. A particularly relevant research topic in the ï¬ eld of Boseâ€“Einstein condensation concerns the realization of binary mixtures in the presence of coherent coupling Î©. These systems show properties having analogies with the formation of stripe phases, which are related to supersolidity, or with the formation of domain walls, which are related to quark conï¬ nement in quantum chromodynamics. Technically, the

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48

Fava, Eleonora. "Static and dynamics properties of a miscible two-component Bose-Einstein condensate." Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/2789/1/PhD_Fava.pdf.

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One of the main reasons which makes Bose-Einstein condensates a successful topic of research is their ﬂexibility for creating systems whose Hamiltonian can be engineered almost at will. A particularly relevant research topic in the ﬁeld of Bose–Einstein condensation concerns the realization of binary mixtures in the presence of coherent coupling Ω. These systems show properties having analogies with the formation of stripe phases, which are related to supersolidity, or with the formation of domain walls, which are related to quark conﬁnement in quantum chromodynamics. Technically, the realizat

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49

Damon, François. "Sonder des structures complexes avec des ondes de matière." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30342/document.

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Ce manuscrit présente les travaux que j'ai effectués au Laboratoire de Physique Théorique durant ma thèse. Ils portent sur l'interaction d'ondes de matière avec des réseaux optiques modulables en temps et en espace. L'utilisation de ces réseaux a permis de contrôler de manière cohérente les propriétés dynamiques d'un gaz d 'atomes ultra-froids. Cette étude théorique a été réalisée en collaboration avec le groupe Atomes Froids du Laboratoire LCAR. Les variations spatiales de l'enveloppe d u réseau créent, localement, des gaps spatiaux créant une cavité de Bragg pour onde de matière, dont nous a

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50

Schreck, Florian. "Mixtures of ultracold gases : Fermi sea and Bose-Einstein condensate of lithium isotopes." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2002. http://tel.archives-ouvertes.fr/tel-00001340.

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Cette thèse décrit l'étude des gaz de fermions $^6$Li et de bosons<br />$^7$Li dans le régime quantique à très basse température. Le<br />refroidissement est obtenu par évaporation du $^7$Li dans un piège<br />magnétique très confinant. Puisque le refroidissement évaporatif<br />d'un gaz de fermion polarisé est quasiment impossible, le $^6$Li<br />est refroidi sympathiquement par contact thermique avec le $^7$Li.<br />Dans une première série d'expériences, les propriétés des gaz<br />quantiques dans les états hyperfins les plus élevés, piégés<br />magnétiquement, sont étudiées. Un gaz de $10^5

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