Relevant bibliographies by topics / Atoms. Magnetic films. Bose-Einstein condensation

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Atoms. Magnetic films. Bose-Einstein condensation'

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

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Journal articles on the topic "Atoms. Magnetic films. Bose-Einstein condensation"

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Lu, B., and W. A. van Wijngaarden. "Bose–Einstein condensation in a QUIC trap." Canadian Journal of Physics 82, no. 2 (February 1, 2004): 81–102. http://dx.doi.org/10.1139/p03-127.

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The apparatus and procedure required to generate a pure Bose-Einstein condensate (BEC) consisting of about half a million 87Rb atoms at a temperature of <60 nK with a phase density of >54 is described. The atoms are first laser cooled in a vapour cell magneto-optical trap (MOT) and subsequently transferred to an ultra-low pressure MOT. The atoms are loaded into a QUIC trap consisting of a pair of quadrupole coils and a Ioffe coil that generates a small finite magnetic field at the trap energy minimum to suppress Majorana transitions. Evaporation induced by an RF field lowers the temperature permitting the transition to BEC to be observed by monitoring the free expansion of the atoms after the trapping fields have been switched off.PACS Nos.: 03.75.Fi, 05.30.Jp, 32.80.Pj, 64.60.–i
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Wieman, Carl E. "Bose–Einstein Condensation in an Ultracold Gas." International Journal of Modern Physics B 11, no. 28 (November 10, 1997): 3281–96. http://dx.doi.org/10.1142/s0217979297001581.

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Bose–Einstein condensation in a gas has now been achieved. Atoms are cooled to the point of condensation using laser cooling and trapping, followed by magnetic trapping and evaporative cooling. These techniques are explained, as well as the techniques by which we observe the cold atom samples. Three different signatures of Bose–Einstein condensation are described. A number of properties of the condensate, including collective excitations, distortions of the wave function by interactions, and the fraction of atoms in the condensate versus temperature, have also been measured.
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Tran, Tien Duy, Yibo Wang, Alex Glaetzle, Shannon Whitlock, Andrei Sidorov, and Peter Hannaford. "Magnetic Lattices for Ultracold Atoms." Communications in Physics 29, no. 2 (May 14, 2019): 97. http://dx.doi.org/10.15625/0868-3166/29/2/13678.

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This article reviews the development in our laboratory of magnetic lattices comprising periodic arrays of magnetic microtraps created by patterned magnetic films to trap periodic arrays of ultracold atoms. Recent achievements include the realisation of multiple Bose-Einstein condensates in a 10 \(\mu\)m-period one-dimensional magnetic lattice; the fabrication of sub-micron-period square and triangular magnetic lattice structures suitable for quantum tunnelling experiments; the trapping of ultracold atoms in a sub-micron-period triangular magnetic lattice; and a proposal to use long-range interacting Rydberg atoms to achieve spin-spin interactions between sites in a large-spacing magnetic lattice.
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Dzyapko, O., V. E. Demidov, G. A. Melkov, and S. O. Demokritov. "Bose–Einstein condensation of spin wave quanta at room temperature." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1951 (September 28, 2011): 3575–87. http://dx.doi.org/10.1098/rsta.2011.0128.

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Spin waves are delocalized excitations of magnetic media that mainly determine their magnetic dynamics and thermodynamics at temperatures far below the critical one. The quantum-mechanical counterparts of spin waves are magnons, which can be considered as a gas of weakly interacting bosonic quasi-particles. Here, we discuss the room-temperature kinetics and thermodynamics of the magnon gas in yttrium iron garnet films driven by parametric microwave pumping. We show that for high enough pumping powers, the thermalization of the driven gas results in a quasi-equilibrium state described by Bose–Einstein statistics with a non-zero chemical potential. Further increases of the pumping power cause a Bose–Einstein condensation documented by an observation of the magnon accumulation at the lowest energy level. Using the sensitivity of the Brillouin light scattering spectroscopy to the degree of coherence of the scattering magnons, we confirm the spontaneous emergence of coherence of the magnons accumulated at the bottom of the spectrum, occurring if their density exceeds a critical value.
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Han, D. J., R. H. Wynar, Ph Courteille, and D. J. Heinzen. "Bose-Einstein condensation of large numbers of atoms in a magnetic time-averaged orbiting potential trap." Physical Review A 57, no. 6 (June 1, 1998): R4114—R4117. http://dx.doi.org/10.1103/physreva.57.r4114.

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Sun, Chen, Thomas Nattermann, and Valery L. Pokrovsky. "Bose–Einstein condensation and superfluidity of magnons in yttrium iron garnet films." Journal of Physics D: Applied Physics 50, no. 14 (March 7, 2017): 143002. http://dx.doi.org/10.1088/1361-6463/aa5cfc.

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Gao, Kui-Yi, Xin-Yu Luo, Feng-Dong Jia, Cheng-Hui Yu, Feng Zhang, Ji-Ping Yin, Lin Xu, Li You, and Ru-Quan Wang. "Ultra-High Efficiency Magnetic Transport of 87 Rb Atoms in a Single Chamber Bose—Einstein Condensation Apparatus." Chinese Physics Letters 31, no. 6 (June 2014): 063701. http://dx.doi.org/10.1088/0256-307x/31/6/063701.

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Nakagawa, K., Y. Suzuki, M. Horikoshi, and J. B. Kim. "Simple and efficient magnetic transport of cold atoms using moving coils for the production of Bose–Einstein condensation." Applied Physics B 81, no. 6 (September 27, 2005): 791–94. http://dx.doi.org/10.1007/s00340-005-1953-8.

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KETTERLE, WOLFGANG. "NEW FORMS OF QUANTUM MATTER NEAR ABSOLUTE ZERO TEMPERATURE." International Journal of Modern Physics D 16, no. 12b (December 2007): 2413–19. http://dx.doi.org/10.1142/s0218271807011462.

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In my talk at the workshop on fundamental physics in space I described the nanokelvin revolution which has taken place in atomic physics. Nanokelvin temperatures have given us access to new physical phenomena including Bose–Einstein condensation, quantum reflection, and fermionic superfluidity in a gas. They also enabled new techniques of preparing and manipulating cold atoms. At low temperatures, only very weak forces are needed to control the motion of atoms. This gave rise to the development of miniaturized setups including atom chips. In Earth-based experiments, gravitational forces are dominant unless they are compensated by optical and magnetic forces. The following text describes the work which I used to illustrate the nanokelvin revolution in atomic physics. Strongest emphasis is given to superfluidity in fermionic atoms. This is a prime example of how ultracold atoms are used to create well-controlled strongly interacting systems and obtain new insight into many-body physics.
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Boev, M. V., A. V. Chaplik, and V. M. Kovalev. "Interaction of Rayleigh waves with 2D dipolar exciton gas: impact of Bose–Einstein condensation." Journal of Physics D: Applied Physics 50, no. 48 (November 6, 2017): 484002. http://dx.doi.org/10.1088/1361-6463/aa92f0.

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Dissertations / Theses on the topic "Atoms. Magnetic films. Bose-Einstein condensation"

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Whitlock, Shannon. "Bose-Einstein condensates on a magnetic film atom chip." Australasian Digital Thesis Program, 2007. http://adt.lib.swin.edu.au/public/adt-VSWT20070613.172308/index.html.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, Centre for Atom Optics and Ultrafast Spectroscopy, 2007.
A thesis submitted for the degree of Doctor of Philosophy, Centre for Atom Optics and Ultrafast Spectroscopy, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, 2007. Typescript. Bibliography: p. 107-118.
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Whitlock, Shannon, and n/a. "Bose-Einstein condensates on a magnetic film atom chip." Swinburne University of Technology, 2007. http://adt.lib.swin.edu.au./public/adt-VSWT20070613.172308.

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Atom chips are devices used to magnetically trap and manipulate ultracold atoms and Bose-Einstein condensates near a surface. In particular, permanent magnetic film atom chips can allow very tight confinement and intricate magnetic field designs while circumventing technical current noise. Research described in this thesis is focused on the development of a magnetic film atom chip, the production of Bose-Einstein condensates near the film surface, the characterisation of the associated magnetic potentials using rf spectroscopy of ultracold atoms and the realisation of a precision sensor based on splitting Bose-Einstein condensates in a double-well potential. The atom chip itself combines the edge of a perpendicularly magnetised GdTbFeCo film with a machined silver wire structure. A mirror magneto-optical trap collects up to 5 x 108 87Rb atoms beneath the chip surface. The current-carrying wires are then used to transfer the cloud of atoms to the magnetic film microtrap and radio frequency evaporative cooling is applied to produce Bose-Einstein condensates consisting of 1 x 105 atoms. We have identified small spatial magnetic field variations near the film surface that fragment the ultracold atom cloud. These variations originate from inhomogeneity in the film magnetisation and are characterised using a novel technique based on spatially resolved radio frequency spectroscopy of the atoms to map the magnetic field landscape over a large area. The observations agree with an analytic model for the spatial decay of random magnetic fields from the film surface. Bose-Einstein condensates in our unique potential landscape have been used as a precision sensor for potential gradients. We transfer the atoms to the central region of the chip which produces a double-well potential. A single BEC is formed far from the surface and is then dynamically split in two by moving the trap closer to the surface. After splitting, the population of atoms in each well is extremely sensitive to the asymmetry of the potential and can be used to sense tiny magnetic field gradients or changes in gravity on a small spatial scale.
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Singh, Mandip. "A magnetic lattice and macroscopic entanglement of a BEC on an atom chip." Swinburne Research Bank, 2008. http://hdl.handle.net/1959.3/55142.

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Thesis (PhD) - Swinburne University of Technology, Centre for Atom Optics and Ultrafast Spectroscopy, 2008.
Thesis submitted for the degree of Doctor of Philosophy, Centre for Atom Optics and Ultrafast Spectroscopy, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, 2008. Typescript. Bibliography: p. 143-158.
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Mallardeau, Catherine. "L'hydrogène atomique polarisé : interaction avec les films d'Helium : expérience de compression." Paris 6, 1986. http://www.theses.fr/1986PA066186.

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Etude expérimentale de certains mécanismes de recombinaison de H| afin de comprendre les limites à l'obtention de la condensation de Bose Einstein. Mesure de l'énergie d'adsorption de H sur une couche mince 4He en fonction de l'épaisseur de la couche, paramètre qui donne les limites de stabilisation de H à basse température; obtention de la stabilisation sur des couches biomoléculaires. Construction d'un dispositif expérimental pour comprimer le gaz H| en champ magnétique de 20t, pour étudier le taux de recombinaison à 3 corps de H à haute densité et en champ magnétique intense.
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Sheard, Benjamin T. "Magnetic transport and Bose-Einstein condensation of rubidium atoms." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:dedece2b-c33a-415b-9d6b-570263042797.

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This thesis describes the design, construction and optimisation of a new apparatus to produce Bose-Einstein condensates (BECs) of 87Rb atoms. The main aim in building this system was to include a high resolution imaging system capable of resolving single atoms. Optical access for the imaging system was created by including a stage of atom transport in which the atoms are magnetically transferred ~50 cm from a magneto-optical trap (MOT), where they are initially collected, to a glass science cell where experiments are carried out and imaging takes place. Two magnetic transport schemes have been demonstrated, based on approaches first used in other laboratories. First, a scheme in which the atoms are transferred in a moving pair of magnetic trapping coils. Second, a hybrid scheme where the atoms are translated part of the distance in the moving coils, and the rest of the way by switching the current in a chain of fixed coils. This second scheme was designed to allow optical access for a high numerical aperture microscope objective to be placed immediately next to the science cell for high resolution imaging. The atoms were first collected in a large pyramid MOT which can be loaded with 3 × 10^9 atoms in a time of 20 s. Around half of these atoms – those in the |F = 1, mF = −1> magnetic substate – were then magnetically trapped prior to transport. The typical fraction of the trapped atoms transferred to the science cell was ~30% and ~18% for the moving coils and hybrid schemes respectively. Evaporative cooling was carried out on the atom cloud following transport with the moving coils and loading into a time-orbiting potential trap. The optimised cooling sequence lasted for 28 s and consistently produced a pure condensate with 5 × 10^5 atoms. A BEC has also been produced by evaporative cooling following hybrid transport. The next experimental steps will be to optimise the hybrid transfer approach further and install the high resolution imaging system. The system is well-placed to continue an ongoing series of experiments in which ultracold atoms are trapped in RF-dressed potentials. These potentials will be used to study low-dimensional quantum gases as well as in experiments where small atom number BECs are rapidly rotated to enter the fractional quantum Hall regime.
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Scharnberg, Falk. "Bose-Einstein condensation in micro-potentials for atom interferometry." Swinburne Research Bank, 2007. http://hdl.handle.net/1959.3/22734.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, 2007.
Submitted in fulfilment of requirements for the degree of Doctor of Philosophy, [Faculty of Engineering and Industrial Sciences], Swinburne University of Technology, 2007. Typescript. Bibliography: p. [207]-224.
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Han, Dian-jiun. "Bose-Einstein condensation of rubidium-87 atoms in a magnetic trap /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Thomas, Nicholas, and n/a. "Double-TOP trap for ultracold atoms." University of Otago. Department of Physics, 2005. http://adt.otago.ac.nz./public/adt-NZDU20070321.160859.

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The Double-TOP trap is a new type of magnetic trap for neutral atoms, and is suitable for Bose-Einstein condensates (BECs) and evaporatively cooled atoms. It combines features from two other magnetic traps, the Time-averaged Orbiting Potential (TOP) and Ioffe-Pritchard traps, so that a potential barrier can be raised in an otherwise parabolic potential. The cigar-like cloud of atoms (in the single-well configuration) is divided halfway along its length when the barrier is lifted. A theoretical model of the trap is presented. The double-well is characterised by the barrier height and well separation, which are weakly coupled. The accessible parameter space is found by considering experimental limits such as noise, yielding well separations from 230 [mu]m up to several millimetres, and barrier heights from 65 pK to 28 [mu]K (where the energies are scaled by Boltzmann�s constant). Potential experiments for Bose-Einstein condensates in this trap are considered. A Double-TOP trap has been constructed using the 3-coil style of Ioffe-Pritchard trap. Details of the design, construction and current control for these coils are given. Experiments on splitting thermal clouds were carried out, which revealed a tilt in the potential. Two independent BECs were simultaneously created by applying evaporative cooling to a divided thermal cloud. The Double-TOP trap is used to form a linear collider, allowing direct imaging of the interference between the s and d partial waves. By jumping from a double to single-well trap configuration, two ultra-cold clouds are launched towards a collision at the trap bottom. The available collision energies are centred on a d-wave shape resonance so that interference between the s and d partial waves is pronounced. Absorption imaging allows complete scattering information to be collected, and the images show a striking change in the angular distribution of atoms post-collision. The results are compared to a theoretical model, verifying that the technique is a useful new way to study cold collisions.
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Magalhães, Kilvia Mayre Farias. "Obtenção da degenerescência quântica em sódio aprisionado." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-24012008-083710/.

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Usando a técnica de resfriamento evaporativo para átomos comprimidos numa armadilha magnética tipo QUIC, implementamos experimentos para observar Condensação de Bose-Einstein de átomos de sódio. Nessa armadilha magnética temos átomos advindos de uma armadilha magneto-óptica, a qual é carregada por um feixe desacelerado como etapa de pré-resfriamento. Nossas medidas foram baseadas em imagens de absorção fora de ressonância de um feixe de prova pela amostra atômica. Essas imagens foram feitas in situ, ou seja, na presença do campo da armadilha magnética, pelo fato do número de átomos ser baixo e a técnica de tempo de vôo não ser adequada a essa situação. Baseado no perfil de densidade e na temperatura medidos, calculamos a densidade de pico no espaço de fase D, a qual é seguida nas várias etapas de evaporação. Nossos resultados mostram que para uma freqüência final de evaporação de 1,65 MHz nós superamos o valor esperado para D (2,612) alcançar o ponto crítico, no centro da amostra, para obter a condensação. Devido ao baixo número de átomos restantes no potencial, a interação não produz efeitos consideráveis e dessa forma um modelo de gás ideal permite justificar essa observação.
Using a system composed of a QUIC trap loaded from a slowed atomic beam, we have performed experiments to observe the Bose-Einstein Condensation of Na atoms. In order to obtain the atomic distribution in the trap, we use an in situ out of resonance absorption image of a probe beam to determine the temperature and the density, which are use to calculate the phase space D. We have followed D as a function of the final evaporation frequency. The results show that at 1.65 MHz we crossed the critical value for D which corresponds to the point to start Bose-Condensation of the sample. Due to the low number of atoms remaining in the trap at the critical point, the interaction produce minor effects and therefore an ideal gas model explains well the observations.
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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
$^7$Li dans le régime quantique à très basse température. Le
refroidissement est obtenu par évaporation du $^7$Li dans un piège
magnétique très confinant. Puisque le refroidissement évaporatif
d'un gaz de fermion polarisé est quasiment impossible, le $^6$Li
est refroidi sympathiquement par contact thermique avec le $^7$Li.
Dans une première série d'expériences, les propriétés des gaz
quantiques dans les états hyperfins les plus élevés, piégés
magnétiquement, sont étudiées. Un gaz de $10^5$ fermions a une
température de 0.25(5) fois la température de Fermi ($T_F$) est
obtenu. L'instabilité du condensat pour plus de 300 atomes
condensés, à cause des interactions attractives, limite la
dégénérescence que l'on peut atteindre. Pour s'affranchir de cette
limite, une autre série d'expérience est menée dans les états
hyperfins bas, piégeable magnétiquement, où les interactions entre
bosons sont faiblement répulsives. Les collisions
inter-isotopiques permettent alors la thermalisation du mélange.
Le mélange d'un condensat de Bose-Einstein (CBE) de $^7$Li et d'un
mer de Fermi de $^6$Li est produit. Le condensat est quasi
unidimensionnel et la fraction thermique peut être négligeable. La
dégénérescence atteinte correspond à $T/T_C=T/T_F=0.2(1)$. La
température est mesurée à partir de la fraction thermique des
bosons qui disparaît aux plus basses températures, et limite notre
précision de mesure. Dans une troisième série d'expérience, les
bosons sont transférés dans un piège optique, et placé dans l'état
interne $|F=1,m_F=1\rangle$, l'état fondamental pour les bosons.
Une résonance de Feshbach est repérée puis exploitée pour former
un condensai où les interactions sont ajustables. Quand les
interactions effectives entre les atomes sont attractives, on
observe la formation d'un soliton brillant de matière. La
propagation de ce soliton sans dispersion sur une distance de
$1.1\,$mm est observée.
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Books on the topic "Atoms. Magnetic films. Bose-Einstein condensation"

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Morawetz, Klaus. Interacting Systems far from Equilibrium. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.001.0001.

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In quantum statistics based on many-body Green’s functions, the effective medium is represented by the selfenergy. This book aims to discuss the selfenergy from this point of view. The knowledge of the exact selfenergy is equivalent to the knowledge of the exact correlation function from which one can evaluate any single-particle observable. Complete interpretations of the selfenergy are as rich as the properties of the many-body systems. It will be shown that classical features are helpful to understand the selfenergy, but in many cases we have to include additional aspects describing the internal dynamics of the interaction. The inductive presentation introduces the concept of Ludwig Boltzmann to describe correlations by the scattering of many particles from elementary principles up to refined approximations of many-body quantum systems. The ultimate goal is to contribute to the understanding of the time-dependent formation of correlations. Within this book an up-to-date most simple formalism of nonequilibrium Green’s functions is presented to cover different applications ranging from solid state physics (impurity scattering, semiconductor, superconductivity, Bose–Einstein condensation, spin-orbit coupled systems), plasma physics (screening, transport in magnetic fields), cold atoms in optical lattices up to nuclear reactions (heavy-ion collisions). Both possibilities are provided, to learn the quantum kinetic theory in terms of Green’s functions from the basics using experiences with phenomena, and experienced researchers can find a framework to develop and to apply the quantum many-body theory straight to versatile phenomena.
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Book chapters on the topic "Atoms. Magnetic films. Bose-Einstein condensation"

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Kenyon, Ian R. "Gaseous Bose–Einstein condensates." In Quantum 20/20, 285–302. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198808350.003.0016.

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The (gaseous) BECs are introduced: clouds of 106−8 alkali metal atoms, usually 87Rb or 23Na, below ~1 μ‎K. The laser cooling and magnetic trapping are described including the evaporation step needed to reach the conditions for condensation. The magnetooptical and Ioffe–Pritchard traps are described. Imaging methods, both destructive and non-destructive are described. Evidence of condensation is presented; and of interference between separated clouds, thus confirming the coherence of the condensates. The measurement of the condensate fraction is recounted. The Gross–Pitaevskii analysis of condensate properties is given in an appendix. How Bragg spectroscopy is used to obtain the dispersion relation for excitations is detailed. Finally the BEC/BCS crossover is introduced and the role therein of Feshbach resonances.
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Schroeder, Daniel V. "Quantum Statistics." In An Introduction to Thermal Physics, 257–326. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192895547.003.0007.

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This chapter begins by extending the Boltzmann distribution to the case of a system that exchanges particles with its environment. This idea finds direct applications ranging from hemoglobin adsorption to ionization of atoms in stars. But the main applications are to dense “gases” in which the quantum behavior of identical particles comes into play. Examples include conduction electrons in metals and semiconductors; white dwarf and neutron stars; photon gases and thermal radiation from incandescent objects; neutrino and electron-positron production in the early universe; quasiparticles associated with vibrations and magnetic excitations in solids; and Bose-Einstein condensation of ultracold clouds of atoms.
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Conference papers on the topic "Atoms. Magnetic films. Bose-Einstein condensation"

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Courteille, Philippe W., Dian-Jiun Han, Roahn H. Wynar, and Daniel J. Heinzen. "New observation of Bose-Einstein condensation of 87Rb atoms in a magnetic TOP trap." In Optoelectronics and High-Power Lasers & Applications, edited by Bryan L. Fearey. SPIE, 1998. http://dx.doi.org/10.1117/12.308369.

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