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 54 for “"cold atoms"”.
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QUANTUM TRANSPORT WITH COLD ATOMS
Cold atom technology poses a powerful platform to study the transport of quantum matter. The interaction between atoms, the type of atoms and their confinement can be designed to simulate quantum transport phenomena that are often difficult to realize within solid state devices. Recent advances in …
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Ultra-Cold Atoms on Optical Lattices
In the second half of the dissertation, we investigate the problem of vortex trapping in cyclically coupled Bose-Josephson junctions. Starting with N independent BECs we couple the condensates through Josephson links and allow the system to reach a stable circulation by adding a dissipative term in …
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Self-organized magnetization patterns in cold atoms
… magnetization patterns in a cloud of cold atoms driven far from equilibrium by a pump laser beam. The experiments are performed in the single mirror feedback configuration, where transverse ordering occurs due to amplification of fluctuations in the atomic medium at critical …
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Many-body decoherence with cold atoms in optical lattices
Ultracold atoms in optical lattices have proven to be an ideal testbed for simulating strongly correlated condensed matter physics. The microscopic understanding of the underlying Hamiltonian and precise control over the Hamiltonian parameters via external fields allow faithful realisation of …
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Development Of A Cold Atoms Platform For A DQC1 Implementation
… work we report on the development progress of a cold atoms platform to demonstrate a model of quantum computation known as deterministic Quantum computing with One Clean Qubit (DQC1). This is a novel class of algorithms where interactions between qubits enable nonclassical correlations other than …
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Forward Light Scattering in an Extended Sample of Cold Atoms
… results on the forward emitted light from a cold atomic sample of 87Rb. Specifically,we study single-photon superradiance which is characterized by a rapid decay faster than the single atom lifetime with the light preferentially emitted in the forward direction. Additionally, we report …
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Topics in Spin-Orbit Coupling in Cold Atoms and Semiconductors
… of topics on the spin-orbit coupling of cold atoms and semiconductors. We first consider the effects of an optically induced spin-orbit interaction on a system of Bosonic atoms. The spin-orbit term couples the emergent pseudo-spin- 1/2 degree of freedom to momentum. The single particle …
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From quarks to cold atoms: the phases of strongly-interacting systems
… neutron and quark stars, and the phases of ultracold fermions in the presence of an artificial spin-orbit coupling. While spanning an extraordinary twenty orders of magnitude in energy scales, these systems exhibit some remarkable similarities including non-perturbative many-body interactions, …
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Magnetic super-exchange with ultra cold atoms in spin dependent optical lattices
… of a solid state system. The study of these cold atoms in optical lattice systems may prove a very useful testing ground for novel states of matter, testing fundamental condensed matter theory, and may help illuminate a possible connection between the mechanism behind high temperature …
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Fermionic superfluids : from cold atoms to high density QCD : gapless (breached pair) superfluidity and kaon condensation
In this thesis, we explore aspects of fermionic superfluidity through a mean-field approximation. Our framework is extremely general, includes both pairing and Hartree-Fock contributions, and is derived rigorously from a variational principle. This framework allows us to analyze a wide range of …
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Coherent Transport of Matter Waves in Disordered Optical Potentials
… for the cooling and the manipulation of atoms in recent years, and the possibility to create Bose-Einstein condensates and degenerate Fermi gases and to load them into regular optical lattices or disordered optical potentials, has evoked new interest for the disorder-induced localization …
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Laser cooling of rubidium atoms in a magneto-optical trap
… experimental work concerning radiation forces on atoms, with particular reference to rubidium atoms confined in a magneto-optical trap. After a short history of the field of laser cooling, a review of the semiclassical theory of mechanical interactions between two-level atoms and electromagnetic …
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Interaction of trapped ions with trapped atoms
… the Atom-Ion trap for collision studies between cold atoms and cold ions, and the Cavity-Array trap for studying the interaction between ionic ensembles and photons. The Atom-Ion trap overlaps a surface-planar ion trap with a magneto-optical trap (MOT) for neutral atoms. The initial results of …
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Strongly correlated ultra-cold bosonic atoms in optical lattices
… our understanding of these systems. Studies in cold atom systems are of interest since cold atom experiments provide a control on model parameters.<br><br> In this thesis, we use novel analytical and computational techniques to treat strongly interacting bosonic systems. Taking advantage of the …
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Hybrid approaches to quantum information using ions, atoms and photons
… for quantum information processing - one joining cold ions and cold atoms and another coupling linear chains of atomic ions with photons via an optical resonator. The first experimental realization of a hybrid cold-ion / cold-atom system is presented in the form of Yb atoms trapped in a …
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Photoassociative ionization in cold rubidium
… community are interested in the prospect of cold molecules for such applications as quantum computing and molecular Bose-Einstein condensates. Current methods of production fall short of the requirements for such projects. Photo association is a promising technique for forming cold molecules, …
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The integration of fibre optics for atom chips
… has resulted in exquisite control of cold atoms above surfaces, allowing the vision of a matter wave toolbox to come closer to fruition. However, although the size of the components necessary for guiding atoms via magnetic or electrostatic fields has been greatly reduced, there is …
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MOMENTUM SIGNATURES OF THE ANDERSON TRANSITION
… observables for wide range of systems, from cold atoms to classical waves or any wave systems where the momentum distribution is accessible.
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One-dimensional Bose-Einstein condensates in micro-traps
… which enables to collect up to 3x10^8 cold atoms close to the reflecting surface of an atom chip. These atoms are subsequently transferred to micro-traps generated by wires mounted on the atom chip and Bose-Einstein condensation has been achieved. The Bose-Einstein condensates (BECs) …
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