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 18 of 18 for “"atomic gas"”.
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Light Propagation in Ultracold Atomic Gases
The propagation of light through an ultracold atomic gas is the main topic of the present work. The thesis consists of two parts. In Part I (Chapters 1,2,3), we give a complete description of the 1D photonic bands of a MI of two-level atoms paying attention to both band diagrams and reflectivity …
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The relation between atomic and molecular gas: the Magellanic Clouds and beyond
… and radio interferometry imaging, to study the atomic and molecular gas relation in the Large/Small Magellanic Clouds and 43 nearby galaxies. These galaxies demonstrate various galactic environments compared with the Milky Way and provide an ideal sample for testing the cloud-scale and …
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Light Scattering in Ultracold High Density Rubidium Vapor
… world full of new opportunities for research in atomic, molecular and optical physics as well as condensed matter physics. It became possible to do experiments under conditions that are hard to achieve in condensed matter systems but recently have been observed in atomic systems. Bose Einstein …
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Universality in the Equilibration of Quenched Yukawa One Component Plasmas
… (UNP) created by photoionization of an ultracold atomic gas. The rapid quench to a UNP results in an equilibration process known as Disorder Induced Heating (DIH). Even after DIH the plasma is strongly coupled, with Γ~3. During DIH, oscillations in 1/Γ (i.e. scaled Kinetic Energy) occurring at …
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Formation and decay of a Bose-Einstein condensate in atomic hydrogen
… 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 and decay …
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Interacting Fermi Gases
Interacting Fermi gases are one of the chief paradigms of condensed matter physics. They have been studied since the beginning of the development of quantum mechanics, but continue to produce surprises today. Recent experimental developments in the field of ultracold atomic gases, as well as …
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Localization and spreading of matter waves in disordered potentials
… to the connection of our findings with ultracold atomic gases experiments. We concentrate on two main issues: the interplay between localization and interaction in disordered systems and the problem of localization in correlated random potentials. The first problem is investigated considering the …
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Light-induced many-body correlations in ultracold gases
… and probe the quantum correlations in ultracold gases using light. A high-finesse optical cavity is used to enhance the atom-light interaction and we can produce a variety of entangled states which can overcome the standard quantum limit. The quantum correlations are generated by sending very …
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Superfluidity in a uniform two-dimensional Bose gas
… 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 concentrating on its distinct features …
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Quasi-particle Breakdown and Heat Transport in a Homogeneous Strongly-interacting Fermi Gas
… on a homogeneous strongly-interacting Fermi gas, consisting of a spin mixture of ⁶Li atoms with interactions induced by a Feshbach resonance. The tunability and universality of this atomic gas make it an ideal platform to study many-body physics of interacting Fermi systems. The …
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Star formation and disk stability in nearby galaxies
… gravity in a galactic disk to determine where gas collapses to form stars. Studies on this have mainly focused on the radial variation of the gravitational stability parameter and how it relates to the radial variations in the star formation activity. In this study, we look at the two …
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Dynamics in Cold Atomic Gases: Resonant Behaviour of the Quantum Delta-Kicked Accelerator and Bose-Einstein Condensates in Ring Traps
In this thesis, the dynamics of cold, trapped atomic gases are investigated, and the prospects for exploiting their nonlinear dynamics for inertial sensing are discussed. In the first part, the resonant and antiresonant dynamics of the atom-optical quantum delta-kicked accelerator with an initial …
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Evolution of the Circumstellar Atomic and Molecular Envelopes Around Evolved Stars
… shape the CSE prior to the PN stage, the neutral atomic and molecular gas are probed. Here we present observations of the atomic and molecular components of the CSE for objects at different epochs of evolution. Far-infrared (FIR) spectra were taken for 24 evolved stars, including the line emission …
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Spatially-resolved studies of nearby star-forming galaxies
… properties of H II regions and the surrounding gas within three BCDs, using integral field spectroscopic (IFS) data from the Gemini Multi-Object Spectrograph-North. While answering questions related to chemical homogeneity, ionisation mechanisms and stellar populations within BCDs, I address …
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Topological phenomena in ultracold atomic gases
… ways to measure such consequences in ultracold atomic gas experiments. These experiments have significant advantages over the solid-state as ultracold atoms are controllable, tuneable and clean. They can also be used to investigate properties which are inaccessible in other quantum systems. We …
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Quasi-One-Dimensional Ultracold Fermi Gases
… condensed matter phenomena. The advantage of atomic physics experiments is that they provide an easily tunable system. This experiment uses the lowest two ground state hyperfine levels of fermionic lithium. Having two different states creates a pseudo-spin-1/2 system and allows us to emulate …
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Studying the Large Scale Structure and interstellar Medium of Galaxies During the Epochs of Peak Cosmic Star formation and Reionization With Infrared Fine Structure Lines
… broad range of astrophysical environments, such gas irradiated by stellar far-ultraviolet (FUV) photons or X-rays from accreting supermassive black holes, called active galactic nuclei (AGN). The transparency of these lines to dust and their high escape fractions into the intergalactic medium …