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 332 for “"Bose"”.
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The dynamics of bose gases
… equations that models the dynamics of Bose gases and arises in the derivation of the cubic and quintic nonlinear Schrödinger equations from an N-body linear Schrödinger equation. In Chapter 2, we consider the cubic case in R³ and derive the GP hierarchy in the strong topology …
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Spin-orbit coupled Bose gases
Quantum simulation is a very active and growing field. Various quantum systems can be used to emulate existing materials in an accurate and controllable way, as well as to generate new states of matter that have not been found in the real world but the existence of which does not contradict the …
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Quantum metrology with Bose-Einstein condensates
… in particular rotation measurements using Bose-Einstein condensates, that are robust to losses. We begin by describing how, by loading a Bose-Einstein condensate into an optical ring lattice, multiport beam splitters are created through a simple raising and lowering of potential barriers …
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Bose-Einstein-Kondensate in Mikrochip-Fallen
… Arbeit wird die erstmalige Erzeugung eines Bose-Einstein-Kondensats in einer Mikrochip-Falle beschrieben; dies ist eine Magnetfalle für Neutralatome, die mithilfe stromführender Leiterbahnen auf einem Chipsubstrat gebildet wird. Die Eigenschaften dieser Chipfallen, speziell die hohen …
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Quenching normal Bose gases to Unitarity
… interactions in three-dimensional thermal Bose gases, with particular emphasis on the unitary regime of maximal interactions. We use 39K, a bosonic isotope, in anisotropic harmonic optical trapping potentials. In the unitary Bose gas we find many-body complexity introduced by the …
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Bose condensates and the atom laser
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Quantum reflection of Bose-Einstein Condensates
Recent developments in atom optics have brought Bose-Einstein condensates within 1 pm of solid surfaces where the atom-surface interactions can no longer be ignored. At long- range, the atom-surface interaction is described by the weakly attractive Casimir-Polder potential which is classically …
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Dynamics of finite momentum Bose polarons
… impurity immersed in a weakly interacting Bose-Einstein condensate (BEC) of ultra-cold atoms near an interspecies Feshbach resonance. Using the time-dependent variational approach, we study both ground state properties and quench dynamics of the system after a sudden immersion of the …
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Coherent decay of Bose-Einstein condensates
… coldest form of matter known to exist, atomic Bose-Einstein condensates are unique forms of matter where the constituent atoms lose their individual identities, becoming absorbed into the cloud as a whole. Effectively, these gases become a single macroscopic object that inherits its properties …
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Bose-Einstein condensation of atomic hydrogen
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Bose-Einstein condensation of sodium atoms
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Tunneling Dynamics of a Bose-Einstein Condensate
The simplicity and versatility of ultra-cold atoms make it an ideal system for studying Quantum Mechanical phenomenon like tunneling. This thesis describes progress towards experimentally measuring the time spent by a tunneling particle in the classically forbidden region. A detailed analysis of …
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Bogoliubov Excitations of Inhomogeneous Bose-Einstein Condensates
… first part deals with repulsively interacting Bose-Einstein condensates in speckle disorder potentials. In the Bogoliubov approach, the many-body problem is split into the Gross-Pitaevskii condensate (mean-field) and the Bogoliubov excitations, which are bosonic quasiparticles. The disorder …
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Quasi-condensation in low-dimensional Bose gases
… of the present thesis is the one-dimensional Bose gas. Since long-rang order is destroyed by infra-red fluctuations in one dimension, only the formation of a quasi-condensate is possible, which exhibits suppressed density fluctuations, but whose phase fluctuates strongly. It is shown that …
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Atomlaser und Phasenkohärenz atomarer Bose-Einstein-Kondensate
… Auskopplung von Atomen aus einem atomaren Bose-Einstein-Kondensat berichtet. Es wurde so eine kohärente Strahlquelle für Materiewellen entwickelt, die aufgrund ihrer Analogie zu der Erzeugung von Licht in einem Laser als Atomlaser bezeichnet wird. In einer neu entwickelten magnetischen …
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Experiments with interacting Bose and Fermi gases
… with bosonic 23Na. For this, an existing 23Na Bose-Einstein condensation apparatus was upgraded to an experiment capable of producing degenerate 6Li Fermi gases and 6Li-23Na degenerate Fermi-Bose mixtures. The cooling methods have been developed in two different stages, resulting in the …
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Novel ground states of Bose-condensed gases
Bose-Einstein condensates (BEC) provide a novel tool for the study of macroscopic quantum phenomena and condensed matter systems. Two of the recent frontiers, quantized vortices and ultracold molecules, are the subject of this thesis. The formation of highly-ordered vortex lattices in a …
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⁸⁷Rubidium Bose-Einstein condensates in optical lattices
Bose-Einstein condensates in optical lattices have proven to be a powerful tool for studying a wide variety of physics. In this thesis a series of experiments using optical lattices to manipulate 87Rb Bose-Einstein condensates are described. A systematic shift of the photon recoil momentum due to …
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Manipulating Bose-Einstein condensates with laser light
A dilute gas Bose-Einstein condensate was probed and manipulated by off-resonant laser beams. Spontaneous and stimulated off-resonant light scatterings were studied experimentally. Stimulated, two-photon Bragg scattering was used for spectroscopic measurement of the mean-field energy and of the …
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Dynamic properties of dilute Bose-Einstein condensates
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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