Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"superfluidity"”.
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Superfluidity and random media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1993.
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Fermion Superfluidity and Confining Interactions
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T21:35:22Z No. of bitstreams: 1 Galal.pdf: 1144563 bytes, checksum: f9b1a0ba35c6d9dcc790d501020279df (MD5)
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Ultracold Bosonic Gases: Superfluidity and Quantum Interferometry
… dissertation are twofold. Firstly, the study of superfluidity, presented in the first part, has more a fundational character, since we investigate some well known problems, already raised in the context of superfluid helium, in order to gain a deeper understanding, by exploiting the cleannes of …
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Superfluidity in a uniform two-dimensional Bose gas
… thesis describes experimental studies regarding superfluidity in a two-dimensional gas of ultracold atoms trapped in a uniform potential. It is conceptually divided into three parts. In the first part we offer a theoretical discussion of a superfluid, first from a general perspective and then …
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Pairing and superfluidity in strongly interacting Fermi gases
… known as the Chandrasekhar-Clogston limit of superfluidity. Pairing correlations in the superfluid and normal phase are studied with radio-frequency (rf) spectroscopy. A signature of strong correlations is observed above the critical temperature but also at spin polarizations where …
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High-temperature superfluidity in an ultracold Fermi gas
… by the presence of the surrounding particles. Superfluidity and phase coherence in these systems was directly demonstrated throughout the crossover via the observation of long-lived, ordered vortex lattices in a rotating Fermi mixture. Finally, superfluidity in imbalanced Fermi mixtures was …
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Colliding and moving Bose-Einstein condensates : studies of superfluidity and optical tweezers for condensate transport
… 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 impurities through a trapped condensate. The impurities …
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Fermionic superfluids : from cold atoms to high density QCD : gapless (breached pair) superfluidity and kaon condensation
In this thesis, we explore aspects of fermionic superfluidity through a mean-field approximation. Our framework is extremely general, includes both pairing and Hartree-Fock contributions, and is derived rigorously from a variational principle. This framework allows us to analyze a wide range of …
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Theory of Quantum Degenerate Gases
… scope, involving issues of coherence, stability, superfluidity, and kinetics. I explore six topics which exemplify the rich and exciting physics of cold alkali atoms: first, the effect of interactions on the transition temperature of a dilute Bose gas; second, the connection between broken …
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Quantum Monte Carlo Study of Zero -Point Effects in Different Systems
… sizes quantum melt and become superfluid easily. Superfluidity is localized on the surface of large clusters, while solid-like order prevails at the core.
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Novel Quantum Monte Carlo Approaches for Quantum Liquids
… tools for augmenting our current knowledge of superfluidity and superconductivity. In this thesis, I present two new quantum Monte Carlo techniques, the Monte Carlo Power Method and Bose-Fermi Auxiliary-Field Quantum Monte Carlo, and apply previously developed Path Integral Monte Carlo methods …
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Quantized vortices in arbitrary dimensions and the normal-to-superfluid phase transition
… in the cases of three- and four-dimensional superfluidity. By using the analogy between vortical superflow and Ampµere-Maxwell magnetostatics, the equilibrium superflow containing any specified collection of vortices is constructed. The energy of the superflow is found to take on a simple …
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A Lagrangian formulation of a theory of a scalar field superfluid dark matter
… Lagrangian of the theory of dark matter superfluidity. The second and third chapters of the thesis are a review. In the fourth chapter we show that a complex scalar field whose dynamics are dictated by such a Lagrangian, models dust in the background universe on cosmological scale. Prior …
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Effects of interactions on correlation, thermalization, and transport of exciton-polaritons
… phenomena such as Bose-Einstein condensation and superfluidity up to room temperature. Meanwhile, the effect of photon dressing only reduces the exciton-exciton interaction strength by the Hopfield coefficient, which sets the polariton-polariton interaction strength to be exciton-like.
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Pairing and entanglement: quantum Monte Carlo studies
… study two ideas in quantum many-body problems: superfluidity and entanglement. Density matrices are presented a central tool in the analysis, as are discussed in the review of path integral Monte Carlo (PIMC) and variational Monte Carlo (VMC) methods. PIMC is used to model a one-dimensional …
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Light Scattering in Ultracold High Density Rubidium Vapor
… Condensation, the Mott insulator transition, and superfluidity are examples of such achievements. Another considerable interest to both condensed matter and atomic physics is Anderson localization of light. The localization phenomenon is named after P. W. Anderson who suggested the possibility of …
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Towards a holographic description of pulsar glitch mechanism
… special attention to the models of holographic superfluidity that admit vortex-like solutions. The basic identification of the characteristic free energy configuration of global vortices in the AdS/CFT prescription enables to motivate its use in studying the pulsar glitch mechanism. The last …
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Anarchy in Critical Dystopias: An Anatomy of Rebellion
… that expands and flows, nearing a point of superfluidity. The primary focal points of analysis are Ursula K. Le Guin's novel The Dispossessed, the graphic novel V for Vendetta, created by Alan Moore and David Lloyd, and the film The Matrix, written and directed by the Wachowski Brothers. …
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The BCS - BEC Crossover in Ultracold Fermion Gases
… phases in a unified way. The onset of superfluidity is signalled by the emergence of a massless Goldstone mode associated with the broken continuous U(1) symmetry. Beyond Mean Field, we include fluctuations of the molecule field self-consistently via the solution of suitable …
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Spin-orbit coupled Bose-Einstein condensates with observation of a stripe phase
… symmetry of the lattice while maintaining superfluidity indicates the formation of a lattice supersolid which we detected with Bragg scattering. Finally, the density modulation of the stripe phase is measured with a Bragg reflected beam and a camera setup to resolve the angular spread of …
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