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 29 for “"Quantum gases"”.
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Properties of rotating ultracold bosonic quantum gases
… study rotational properties of ultracold bosonic quantum gases in two trapped configurations, a quasi-two-dimensional gas in a harmonic trap and a quasi-one-dimensional gas in a toroidal trap. First, we investigate the effects of correlations on the properties of the ground state of the rotating …
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Ultracold quantum gases in three-dimensional optical lattice potentials
… in the many body physics of ultracold atomic gases. A Bose-Einstein condensate is loaded into a three-dimensional optical lattice potential formed by a standing wave laser light field. In this novel quantum system we have been able to both realize a quantum phase transition from a superfluid …
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Spin-orbit coupling and supersolidity in ultracold quantum gases
Ultracold quantum gases provide a clean, isolated, and controllable platform for simulating and characterizing complex physical phenomena. In this thesis, I present several experiments on realizing one-dimensional spin-orbit coupling in ultracold 23Na gases and the creation of a new form of matter …
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Homogeneous quantum gases: strongly interacting fermions and rotating bosonic condensates
Quantum gases are an ideal platform for studying problems in many-body physics. Highly tunable and reconfigurable, these systems work as quantum simulators for a range of other quantum mechanical systems, ranging from neutron stars, to superconductors, to quantum Hall systems. A crucial degree of …
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Ultracold quantum gases in one-dimensional optical lattice potentials : nonlinear matter wave dynamics
In this thesis I report on experiments on the quantum dynamics of matter waves in a onedimensional lattice potential. A 87Rb Bose-Einstein condensates is prepared in a one-dimensional waveguide in the lowest band of a superimposed optical lattice potential. The action of a weak lattice potential …
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Quantum simulation and out-of-equilibrium dynamics of quantum gases in optical cavities
Ultracold atomic gases loaded into optical cavities constitute one of the most versatile platforms for the study of out-of-equilibrium dynamics and quantum simulation of many- body systems. In this thesis, we explore these two possibilities, motivated by current state-of-the-art atom-cavity …
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Development Of Theoretical And Computational Methods For Few-body Processes In Ultracold Quantum Gases
… two related three-body processes in ultracold quantum gases: three-body resonances and three-body recombination. Three-body recombination causes the ultracold gas to heat up and atoms to leave the trap where they are confined. Therefore, it is an undesirable effect in the process of forming …
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Experimental Platform for a Box-Trapped Dipolar Quantum Gas
… many-body physics in homogeneous dipolar quantum gases of erbium. The interest in such systems lies in a multitude of quantum phenomena that stem from dipole-dipole interactions, particularly their long-range and anisotropic nature. Consequentially, dipolar quantum gases make up an …
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Super-resolution Control of Ultracold Dipolar Atoms on a 50-nm Scale
Degenerate quantum gases of magnetic atoms such as dysprosium (Dy) and erbium (Er) offer new opportunities to quantum simulation research due to their large spin degree of freedom and long-range dipole-dipole interactions. In this thesis, following an introduction to the fundamental properties of …
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From strongly-interacting Bose-Fermi mixtures to ultracold molecules
This thesis describes experiments on ultracold quantum gases. First, I discuss quantum simulation involving mixtures of bosonic and fermionic atoms. Second, I present work on creating and controlling ultracold dipolar molecules of ²³Na⁴⁰K. The rich phase diagram of Bose-Fermi mixtures was studied …
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Ultracold quantum scattering in the presence of synthetic spin-orbit coupling
… physical systems ranging from ultracold dilute quantum gases to energetic quark- gluon plasmas. In this dissertation, we study the low-energy atomic collision physics in the presence of synthetic gauge fields, which are generated by atom-light interaction. One category of synthetic gauge fields …
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Bounds on the growth of high Sobolev norms of solutions to nonlinear Schrödinger equations
… as the Gross-Pitaevskii equation for dipolar quantum gases in the physically relevant 3D setting. The other method is based on a rough cut-off in frequency and it allows us to bound the growth of fractional Sobolev norms of the completely integrable defocusing cubic NLS on the real line.
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Elastic and inelastic dipolar scattering
Quantum gases offer experimentalists and theorists a versatile and controllable platform to study quantum physics. From simple individual atoms, physicists can build complex systems that show new phenomena. Most of those emerging phenomena arise from interactions. The strength of the interactions …
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Geometric Squeezing of a Degenerate Fermi Gas
Quantum simulation with ultracold gases provides a highly customizable platform for the study of many-body physics, shedding new light on important physical systems. Magnetic fields or, equivalently in the case of a uniform, static field, rotation are especially important parameters for many-body …
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A new apparatus for experiments with Caesium Bose-Einstein Condensates
… Feshbach resonances, which enables the study of quantum gases in attractive and repulsive interaction regimes. An ultra-high vacuum system, laser systems and magnetic field coils were assembled to trap and cool the atoms from room temperature to temperatures on the order of 1 nK. Absorption …
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Strongly interacting quantum mixtures of ultracold atoms
… construction of a new apparatus for ultracold quantum gases as well as the scientific results this machine has produced so far. This new apparatus is capable of simultaneously cooling and trapping lithium, sodium, and potassium. It therefore provides a platform to study a large variety of …
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Exploring Atom-Light Scattering in the Quantum Regime
… are promising platforms for exploring modern quantum science and technologies, such as quantum simulation and quantum computation. Here, light is the essential tool to manipulate and probe these systems. However, unlike in condensed matter systems where scattering experiments are routinely …
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Rotating Nonlinear States in Gross-Pitaevskii Equations
… equation is a well-known model for ultra-cold quantum gases in rotating traps. Our results include two main directions: (1) Approximate solutions known as semiclassical wave packets to weakly nonlinear Schr\"odinger equations with rotation. (2) Existence and dynamical properties of rotating …
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