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Showing 1 to 20 of 73 for “"Optical lattices"”.
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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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Quasicrystalline optical lattices for ultracold atoms
… processes and stability. Ultracold atoms in optical lattices offer an ideal, yet untested environment for investigating quasicrystals. Optical lattices, i.e. standing waves of light, allow the defect-free formation of a large variety of potential landscapes, including quasiperiodic …
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Control of neutral atoms in optical lattices
… problem we show how the transport of atoms in an optical lattice can be controlled through variation of the polarization of the optical lattice and the application of global microwave pulses. This type of control control is a first step in many of the schemes for quantum computation and quantum …
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Quantum simulation in strongly correlated optical lattices
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-07-20T15:57:21Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 3 thesis.bib: 93320 bytes, checksum: cc18186d831e1c8c8f0b0d694dddb2fe (MD5) thesis.tex: 978906 bytes, checksum: …
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⁸⁷Rubidium Bose-Einstein condensates in optical lattices
Bose-Einstein condensates in optical lattices have proven to be a powerful tool for studying a wide variety of physics. In this thesis a series of experiments using optical lattices to manipulate 87Rb Bose-Einstein condensates are described. A systematic shift of the photon recoil momentum due to …
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Localisation of Bose-Einstein condensates in optical lattices
… and controlled effectively when trapped in optical lattices formed by two counter-propagating laser beams. The dynamics of Bose-Einstein condensates in optical lattices are well-described by a continuous model using the Gross-Pitaevskii equation in a modulated potential or, in the case of …
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TOWARDS ULTRACOLD FERMIONS IN 2D DISORDERED OPTICAL LATTICES
… fermions in a two dimensional disordered optical lattice governed by the Fermi-Hubbard model.
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CONFINED ULTRACOLD BOSONS IN ONE DIMENSIONAL OPTICAL LATTICES
… covering the field of ultracold atoms loaded in optical lattices. The static and dynamical properties of atoms in combined periodic and parabolic potentials are studied, with a focus on the strongly interacting regimes. Because parabolic magnetic and optical potentials are routinely used to …
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Vortex Configurations Of Bosons In Rotating Optical Lattices
Atomic clouds in a rotating optical lattice are at the intellectual intersection of several major paradigms of condensed matter physics. An optical lattice simulates the periodic potential ubiquitous in solid state physics, while rotation probes the superfluid character of these cold atomic gases …
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Phase transitions in quasiperiodic and driven optical lattices
Ultracold atoms in optical lattices are a versatile tool for precisely-controlled quantum simulation of a range of condensed matter phenomena. This thesis describes work to apply this tool in two areas: the simulation of quasicrystalline materials with a novel lattice geometry, and the use of …
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Properties of dirty bosons in disordered optical lattices
The study of the disordered Bose-Hubbard model is key to understanding the interplay of disorder and interactions. Despite many studies with uniform diagonal disorder, few have inquired into experimental realizations with an additional correlated off-diagonal disorder. The presence of a trap and …
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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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Strongly correlated ultra-cold bosonic atoms in optical lattices
… developed new confining method for cold atoms on optical lattices. Atoms are confined via a hopping integral that decreases as a function of the distance from the center of the lattice. This method might lead to lower temperatures than existing diagonal confinement methods. Next, we study the …
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Non-equilibrium dynamics of ultracold atoms in optical lattices
… 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 energies. We …
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Friction under microscope with trapped ions in optical lattices
… system by studying the motion of atoms in optical lattices. Trapped ions are the epitome of a strongly-interacting cold-atom system, but until now have been limited to simulating spin systems. In this thesis work, a toolbox is developed for combining trapped ions with optical lattices and …
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Artificial gauge fields and quantum hall physics in optical lattices
… artificial gauge fields for ultracold atoms in optical lattices opens a new chapter for the quantum simulation of quantum Hall physics. Motivated by recent advances and refined techniques in controlling quantum gases in optical lattices, this thesis explores how the spatio-temporal control of …
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Locally Tuneable Quantum Hamiltonians with Neutral Atoms in Optical Lattices
Neutral atoms in optical lattices are powerful and versatile quantum simulators of quantum lattice models with many applications. While they have successfully realised many translationally invariant models, the ability to locally tune all local Hamiltonian parameters remains an outstanding goal …
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Ultracold bosons in optical lattices for quantum measurement and simulation
… of quantum measurement and quantum simulation. Optical lattices, created by the AC Stark shift of a coherent laser beam, are a versatile tool to control ultracold atoms and implement novel Hamiltonians. In this thesis, I report on three experiments using the bosonic species Rubidium-87 trapped …
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Creating novel quantum states of ultracold bosons in optical lattices
Ultracold atoms in optical lattices are among the most developed platforms of interest for building quantum devices suitable for quantum simulation and quantum computation. Ultracold trapped atoms are advantageous because they are fundamentally indistinguishable qubits that can be prepared with …
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Phase Transitions in driven 1D and Quasi-Periodic 2D Optical Lattices
Ultracold atoms in optical lattices are a versatile experimental platform. They facilitate precisely controlled quantum simulations of a broad range of condensed matter phenomena. This thesis will describe work undertaken with this platform, to explore phase transitions in two different systems. …
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