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 26 for “"superfluids"”.
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The Hydrodynamics of Rotating Superfluids
Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2011-06-02T19:43:12Z No. of bitstreams: 1 1981_chandler.pdf: 3044838 bytes, checksum: 6acff2375b73676e5e5276afb2c37c5f (MD5)
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The structure of paired boson superfluids
… classical and quantum mechanical models of superfluids and superfluid vortices using the Ginsburg Landau energy equation. Specifically, two types of superfluids are considered, ordinary superfluids where single bosons condense to form a strongly correlated system and superfluids where pairs …
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Excitations in superfluids of atoms and polaritons
This thesis is devoted to the study of excitations in atomic and polariton Bose-Einstein condensates (BEC). These two specimens are prime examples for equilibrium and non equilibrium BEC. The corresponding condensate wave function of each system satisfies a particular partial differential equation …
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Electron-phonon interactions in double layer graphene superfluids
As the scaling of electronic devices continues to decrease, the search for a low- power replacement for complementary metal-oxide semiconductor (CMOS) logic becomes increasingly important. A predicted room temperature phase transition from Fermi liquid to Bose-Einstein condensate of excitons in …
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Two Applications of the Quasiclassical Method to Superfluids
Submitted by Jenny Wong-Welch (wongwel2@illinois.edu) on 2011-11-10T17:37:22Z No. of bitstreams: 1 2001_kos.pdf: 3651976 bytes, checksum: a292779227405b1a0fb6aabbd98e813e (MD5)
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Topological Excitations and Dissipation in Superconductors and Superfluids Having Multiply Connected Geometries
… of phase-slips to the supercurrent in the bulk superfluids connected to the thin channels, as well as avalanches of phase-slips.
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Exotic vortices in superfluids and matrix product states for quantum optimization and machine learning
The interest in vortices and vortex lattices was sparked by the prediction of quantisation of circulation by Onsager in the 1940s. The field has since developed dramatically and attracted a lot of interest across the physics community. In this dissertation we study vortices in two different …
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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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Communal pairing in Fermi gases with attractive interactions
… for spin-imbalanced systems include breached superfluids, Fulde–Ferrell–Larkin–Ovchinnikov theory, and pair density wave theory. We propose a further extension of a superconducting state, dubbed a communal pairing state, whose underlying components are superpositions of Cooper pairs that share …
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Many-body physics and non-equilibrium dynamics in ultracold atomic systems
… solitonic excitations in ultracold fermionic superfluids: the first simulates recent experiments and supports the hypothesis that the solitons generated in those experiments are unstable to the formation of vortex rings; the second demonstrates how population imbalance between up and down spin …
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Photostabilization of J-aggregate cyanine dyes for exciton-polariton based devices
… of room temperature polariton condensates, superfluids, and other exotic phenomena. Using J-aggregates, the aggregated form of cyanine organic dyes, we have previously fabricated light-emitting devices that demonstrated the first ever electrically pumped polariton emission, as well as …
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Homogeneous quantum gases: strongly interacting fermions and rotating bosonic condensates
… box potential. We observe uniform fermionic superfluids and measure the temperature dependence of the noninteracting Fermi surface. Radiofrequency (rf) spectroscopy offers unique insights into the spectral properties of Fermi gases. We exploit the high signal to noise ratio of rf spectroscopy …
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On quantum vortex reconnections
… the phenomenon of quantum reconnections in superfluids, in particular in Bose–Einstein condensates, governed by the Gross–Pitaevskii Equation (GPE). The investigation is applied to two distinct settings. First we study the reconnection between an inclined vortex ring and a straight vortex …
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Tunneling in Degenerate Atomic Gases
… pair of lasers to drive transitions between two superfluids. Finally, in Chapter 9 we examine the properties of vortices formed in trapped Cooper-paired fermionic gases.
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Quantum Dynamics of Strongly-Interacting Bosons in Optical Lattices with Disorder
… coupling. We investigate the transitions between superfluids with different phase patterns, which may be detected by measuring the spin-dependent momentum distribution.
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B phase nucleation and A-B interface dynamics in superfluid 3He
… of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory suitable for studying the dynamics of the first order A-B phase transition. The mechanism for the primary B phase nucleation in the metastable A is not at all understood, …
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B phase nucleation and A-B interface dynamics in superfluid helium-3
… of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory suitable for studying the dynamics of the first order A-B phase transition. The mechanism for the primary B phase nucleation in the metastable A is not at all understood, …
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Study of Ultracold Fermi Gases in the BCS-BEC Crossover: Quantum Monte Carlo Methods, Hydrodynamics and Local Density Approximation.
… geometry, using the hydrodynamic equations of superfluids.
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Spin-obit coupling in optical superlattices
… topological insulators as well as topological superfluids. This thesis will describe the experimental implementation of a new spin-orbit coupled system using pseudospin-1/2 in an optical superlattices, as well as progress towards detecting the stripe phase in this system. The first part of this …
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Compressible Hydrodynamics of Few Body Optical Vortices
… live. Not only do they exist in systems such as superfluids, superconductors, optical fields, or cold atomic gases, for example, but they also exist in our atmospheres, oceans, and even in our veins. This makes understanding and accurately predicting the dynamics of vortices in various systems a …
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