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 31 for “"Quantum gas"”.
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Quantum gas microscopy of strongly correlated fermions
… spin-orbit coupling; the second concerns quantum gas microscopy. With the use of Raman transitions, ID spin-orbit coupling of ultracold 6Li was realized. Using a novel type of spectroscopy, spin-injection spectroscopy, where the spin, energy, and momentum are all resolved, we directly …
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A single-site resolution fermionic quantum-gas microscope
Quantum-gas microscopes have become an important tool in quantum simulation as they enable direct probing of local quantities by single-atom-resolved detection in optical lattices. Recent years have seen many fascinating results from the bosonic quantum-gas microscopes using 87Rb. However, no such …
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Controlling ultracold fermions under a quantum gas microscope
… presents the experimental work on building a quantum gas microscope, employing fermionic 40K atoms in an optical lattice, and precision control of the atoms under the microscope. This system works as a natural simulator of the 2D Hubbard model, which describes materials with strongly …
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Towards a quantum gas microscope for fermionic atoms
… experiment with fermionic ultracold atomic gases. First, we describe the construction of a laser system capable of cooling and trapping gaseous lithium-6 atoms in a 3D Magneto-Optical Trap. Second, we discuss the realization of a 2D Magneto-Optical Trap which, in our experiment, acts as a …
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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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Construction of a quantum gas microscope for fermionic atoms
… ultracold atoms in optical lattices: the Fermi gas microscope. Improving upon similar designs for bosonic atoms, our Fermi gas microscope has the novel feature of being able to achieve single-site resolved imaging of fermionic atoms in an optical lattice; specifically, we use fermionic …
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Fermion pairing and correlations under a quantum gas microscope
Understanding interacting quantum systems is a central goal of modern physics, with applications ranging from quantum chemistry to nuclear physics to the design of novel superconductors. This thesis describes the creation of exotic phases of quantum matter built from ultracold fermionic atoms …
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Quantum Gas Microscopy of Bosonic Correlations in the Continuum
… experimental platform into a high-resolution quantum gas microscope for ultracold 87Rb atoms. Quantum gas microscopes enable site-resolved imaging, providing unprecedented access to quantum statistical effects and many-body phenomena. While such instruments are often employed to study physics …
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A tuneable quantum gas for matter wave interferometry and soliton experiments
The thesis reports on two strands of experiments in which we employ Bose-Einstein condensates of caesium atoms. Caesium provides favourable scattering properties due to a rich spectrum of magnetic Feshbach resonances at low fields. In particular, we take advantage of the tunability of the …
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Dipolar Shielding and Sub-wavelength Bilayers in a Quantum Gas of Dysprosium
… of dipolar relaxation in an ultra-cold gas prepared in an excited Zeeman level. The atoms were confined to ultra-thin layers, with their magnetic moments aligned perpendicularly to the trap such that the dipolar interaction was purely repulsive. In such a configuration we observed an …
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Quantum Computation and Simulation using Fermion Pair Registers
Quantum gas microscopes provide a powerful toolbox for probing quantum many-body physics. Recently, an exciting progress has been reported on realizing a large-scale quantum register of fermion pairs with a quantum gas microscope, in which tightly localized fermion pairs are used to encode qubits …
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Single-atom imaging of 40K atoms via raman sideband cooling
… a T /TF of 0.18, well into the degenerate Fermi-gas regime. We then load the atoms into a 3D optical lattice and prepare ∼ 500 atoms in one anti-node of the vertical lattice. This 2D ‘layer’ of atoms is imaged with single-site resolution, giving us access to the behaviour of quantum many-body …
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Creation of an all-optical Bose-Einstein condensate
… of the two-species, 87Rb and 85Rb, bosonic quantum gas microscope. In particular on the initial cooling and trapping of 87Rb atoms, with the creation of a large all-optically cooled Bose-Einstein condensate as a proof of the temperatures and densities achieved. In most cold atoms …
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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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Artificial gauge fields and quantum hall physics in optical lattices
… 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 optical lattice systems can be exploited for …
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An Atomtronic Study of Two-Dimensional Transport in Disordered Waveguides
This thesis builds upon the concept of quantum simulation, where an inherently quantum system functions as an analogue computer. The programming of the dynamics in the simulator is done through the controlled engineering of the Hamiltonian that describes the time evolution of an ensemble of …
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Quantum simulation with an optical kagome lattice
… and operation of an ultracold atom- based quantum simulator for studying the kagome lattice and the associated flat band. Despite a copious amount of theoretical effort to elucidate the physics of the kagome lattice, experimental kagome physics is still in its infancy. In the case of …
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Phase Stabilised Superlattices for Quantum Simulation
… details the construction and operation of a new quantum simulation experiment for studying bosonic (and in the future fermionic) atoms in interesting triangular superlattice structures. We show that this machine can reliably and stably produce samples of ultracold potassium and rubidium in the …
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Bose-Hubbard physics in the kagome and triangular optical lattices at negative absolute temperature
This thesis describes quantum many-body experiments with ultracold bosonic ³⁹K in the kagome and triangular optical lattices. These lattices display geometric frustration, which manifests itself in a degeneracy at the upper edge of the ground band manifold. In the case of the triangular lattice, …
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An ultracold gas of dipolar fermionic ²³Na⁴⁰K molecules
… against inelastic dimer-dimer reactions. A quantum gas of these molecules have potential applications in quantum simulation of novel dipolar many-body physics, creation of dipolar quantum matter, precision measurements of fundamental constants, and quantum information processing. The work …
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