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 15 of 15 for “"Ultracold gases"”.
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Bose-Fermi mixtures of ultracold gases of dysprosium
… MOT and narrow-line cooling them simultaneously, ultracold Bose-Fermi mixtures of Dy in the ODT were realized (Chapter 8). This thesis is concluded with a discussion of prospect on the Bose-Fermi mixtures of Dy.
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Light-induced many-body correlations in ultracold gases
… generate 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 …
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Topics in multi-component ultracold gases and gauge fields
… on three topics related to multi-component ultracold gases and gauge fields. The first topic that we discuss is artificial gauge fields in ultracold gases. Recently, methods to create artificial gauge fields coupled to neutral ultracold systems using a light-induced Berry's connection have …
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Study of Ultracold Fermi Gases in the BCS-BEC Crossover: Quantum Monte Carlo Methods, Hydrodynamics and Local Density Approximation.
… address some issues concerning the Physics of ultracold Fermi gases, all of them with experimental relevance. The field of ultracold gases, and more recently of ultracold Fermi gases, is gathering a lot of experimental and theoretical interest for two main reasons: the great control on the …
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Observation of the Kibble-Zurek mechanism in a bosonic gas
… Bose-Einstein condensates of atomic sodium gases, following the observations on the spontaneous formation of defects after temperature quenches across the BEC transition. The power-law scaling of the defect number with the quench speed was observed and characterized for the first time in …
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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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MULTI-BAND BOSE HUBBARD MODELS AND EFFECTIVE THREE-BODY INTERACTIONS
Experiments with ultracold atoms in optical lattice have become a versatile testing ground to study diverse quantum many-body Hamiltonians. A single-band Bose-Hubbard (BH) Hamiltonian was first proposed to describe these systems in 1998 and its associated quantum phase-transition was subsequently …
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Superfluidity in a uniform two-dimensional Bose gas
… 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 when …
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Single-atom imaging of 40K atoms via raman sideband cooling
… techniques of preparation and control of dilute ultracold gases. The bulk of the thesis, chapters 3 and 4, deal with the design and optimization of the imaging scheme for site-resolved imaging of 40K atoms. In chapter 5, we describe our work with a rubidium quantum-gas experiment, particularly on …
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Nonlocal correlations between freely propagating pairs of atoms
… experimental apparatus to more stably produce ultracold gases of metastable helium. Massive particles such as atoms exhibit a wave-like behaviour at ultracold temperatures, typically requiring micro-Kelvin temperatures for a dilute gas. Laser cooling and trapping techniques in ultrahigh vacuum …
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Nonlocal correlations between freely propagating pairs of atoms
… experimental apparatus to more stably produce ultracold gases of metastable helium. Massive particles such as atoms exhibit a wave-like behaviour at ultracold temperatures, typically requiring micro-Kelvin temperatures for a dilute gas. Laser cooling and trapping techniques in ultrahigh vacuum …
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Non-equilibrium dynamics of ultracold atoms in optical lattices
… Model and exploring novel cooling techniques for ultracold gases in optical lattices. In the first experiment, we study quenches across the Mott-insulator-to-superfluid quantum phase transition in the 3D Bose-Hubbard Model. The quench is accomplished by continuously tuning the ratio of the Hubbard …
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Topological phenomena in ultracold atomic gases
… finding new 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 …
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Interactions in an ultracold gas of Rydberg atoms
This thesis presents observations of ultralong range interactions <br>in a frozen Rydberg gas. The observed signatures are interactioninduced <br>line broadenings and a suppression of resonant Rydberg excitation. <br>The latter effect can be interpreted as the onset of a local dipole <br>blockade …
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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 possibility of …