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 53 for “"Bose-Einstein condensation"”.
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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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Bose-Einstein condensation of excitons in cuprous oxide
… of particles with mass is known to follow Bose-Einstein statistics. I present experimental observations of the kinetic energy distribution of excitons in the direct-gap semiconductor Cu$\sb2$O, both the triplet orthoexciton state and the singlet paraexciton state. The density and …
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Bose-Einstein condensation from a gluon transport equation
… “overpopulated” initial conditions, a transient Bose-Einstein condensate emerges during equilibriation in a finite time. We further analyse the dynamics of the formation of this condensate. We then extend our scheme to systems with cylindrically symmetric momentum distributions, in order to …
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Bose-Einstein condensation of excitons in uniaxially stressed Cu2O
… bosons, providing a unique system for studying Bose-Einstein statistics and Bose-Einstein Condensation of an ideal gas in the laboratory. In this study, I have applied uniaxial stress to optimize the conditions for a Bose-Einstein Condensation phase transition of the excitons in this crystal. …
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Realization of Bose-Einstein condensation with Lithium-7 atoms
… of Lithium-7 atoms and the realization of the Bose- Einstein condensate as a first step to study quantum magnetism in optical lattice. The techniques used in this experiment include Zeeman slowing, magneto-optical trapping (MOT), gray molasses, static magnetic trapping, evaporative cooling, …
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Bose-Einstein condensation of excitons in uniaxially stressed cuprous oxide
… bosons, providing a unique system for studying Bose-Einstein statistics and Bose-Einstein Condensation of an ideal gas in the laboratory. In this study, I have applied uniaxial stress to optimize the conditions for a Bose-Einstein Condensation phase transition of the excitons in this crystal. …
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Quantum optical states and Bose-Einstein condensation : a dynamical group approach
… dynamical group methods in quantum optics and Bose-Einstein Condensation(BEC) and their use in generalizing some quantum optical states and BEC states. We start by generalizing squeezed coherent states to the displaced squeezed phase number states and studying the signal-to-quantum noise ratio …
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Exciton-polaritons in thermal equilibrium : from Bose-Einstein condensation to exciton-polaritonics
… system, namely, microcavity exciton-polariton Bose-Einstein condensates. Microcavity exciton-polaritons, hereafter simply polaritons, are bosonic quasiparticles formed in a resonant semiconductor microcavity by coupling the excitonic polarizabilities in quantum wells to the transverse mode of …
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Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap
We employ a double-MOT system where atoms are firstly collected for their precooling in a 2D-geometry in a high pressure region. From this source region thereafter, the atoms are efficiently transferred into a conventional MOT inside a UHV chamber with capture rates exceeding 10^8 atoms/s. After a …
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Bose-Einstein condensation in a robust microtrap -- the combination of wire traps and atom chips
… about the successful creation of a Rubidium Bose-Einstein condensate. We use so called magnetic wire traps, which are especially simple, as they consist out of a wire and a homogeneous bias field. These wire traps are especially suited for Bose-Einstein condensation. Furthermore complex …
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Effects of interactions on correlation, thermalization, and transport of exciton-polaritons
… and allows macroscopic quantum 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 …
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One-dimensional Bose-Einstein condensates in micro-traps
… generated by wires mounted on the atom chip and Bose-Einstein condensation has been achieved. The Bose-Einstein condensates (BECs) created in the micro-traps form in the one-dimensional Thomas-Fermi regime. The cross-over between three-dimensional and one-dimensional BECs has been investigated by …
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High-temperature superfluidity in an ultracold Fermi gas
… the molecular side of such a Feshbach resonance, Bose-Einstein condensation of up to 107 molecules was observed. Subsequently, the crossover region interpolating between such a Bose-Einstein condensate (BEC) of molecules and a Bardeen-Cooper-Schrieffer superfluid of long-range Cooper pairs was …
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Three-particle mechanism for unconventional superconductivity with potential applications in moiré materials
… from Bardeen-Cooper- Schrieffer behaviors to the Bose-Einstein condensation of pairs, which has recently attracted a lot of experimental attention. Furthermore, the pairing potential obtained is non-retarded and non-perturbative in the Coulomb interaction strength, leading to strong coupling …
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Light Scattering in Ultracold High Density Rubidium Vapor
… recently have been observed in atomic systems. Bose Einstein 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 …
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Quantum saturation and condensation of excitons in copper (I) oxide
… evidence for degenerate quantum statistics and Bose-Einstein condensation of this nearly ideal gas. We model the time dependence of this bosonic system including exciton decay mechanisms, energy exchange with phonons, and interconversion between ortho (triplet-state) and para (singlet-state) …
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Optical excitations in cold gases
… in the optical spectrum both above and below Bose-Einstein condensation, and show that the spectrum acquires a doublet structure when the condensate forms. We present a detailed theory of spectral shift and an estimate of some of the broadening effects. We derive a sum rule for the average …
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Formation and decay of a Bose-Einstein condensate in atomic hydrogen
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 …
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