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Showing 1 to 20 of 82 for “"ultracold atoms"”.
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Quantum Transport Experiments with Ultracold Atoms
… thesis describes a series of experiments with ultracold atoms in custom optical potentials, detailing quantum simulators developed for analysing the quantum transport properties of specific systems of interest. Two environments in particular are investigated: the quantum chaotic system of the …
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Momentum-space lattices for ultracold atoms
… uses a novel type of ""synthetic"" dimension for atoms of a Bose–Einstein condensate, which we call a momentum-space lattice, to emulate one-dimensional lattice models. The idea of a synthetic dimension or synthetic lattices is a useful construct to describe how the particle dynamics can evolve in …
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Quasicrystalline optical lattices for ultracold atoms
… regarding both growth 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 …
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Exploring spin physics with ultracold atoms
… neural networks, and more. Experiments with ultracold alkali atoms in optical lattices have realized spin models with great success. In particular, the isotropic Heisenberg model---the XXX model---was realized more than a decade ago. The ⁷Li apparatus described here was the first to realize a …
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Double-Loop Microtrap Array for Ultracold Atoms
… kind of magnetic microtrap is demonstrated for ultracold neutral atoms. It consists of two concentric loops of radii $r_1$ and $r_2$ having oppositely oriented currents. A magnetic field minimum is generated in three dimensions that can be used to trap the atoms with a trap depth of about 1 mK …
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Ultracold Atoms in a Disordered Optical Lattice
… to create Bose-Einstein condensates of 87Rb atoms and load condensates into a disordered 3D optical lattice, realizing the DBH model. Also as part of this work, the major technical components needed to implement a stroboscopic quantum simulation scheme were constructed and a number of …
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Ultracold atoms for synthetic one-dimensional quasicrystals
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Strongly interacting quantum mixtures of ultracold atoms
… the 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 …
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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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A new apparatus to simulate fundamental interactions with ultracold atoms
… correspond to internal states of sodium atoms. The coherent mixture, in the miscible regime, also exhibits a metastable excitation consisting in a domain wall of relative phase connecting vortices of different components. Due to the peculiar energy dependence of such a configuration, an …
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Coherent excitation of ultracold atoms between ground and Rydberg states
… and between ground and Rydberg states, in ultracold atoms. In order to study coherent transfer between hyperfine ground states a pair of phase stable Raman beams is required. Both beams are derived from a single master laser before being spatially separated into individual components using …
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Thermometry and cooling of ultracold atoms in an optical lattice
Ultracold atoms of 7Rb were prepared in a mixture of two hyperfine states, F 1, mF = -1 > and 2, -2 >. This two-component system was then studied in the presence of a magnetic field gradient and an optical lattice. The presence of a magnetic field gradient separated the atoms into regions of …
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The dynamics of ultracold atoms in light-induced synthetic gauge fields
… aim of this research is to study the dynamics of ultracold atoms in synthetic gauge fields. In this work, we developed a method to optimize the evaporation of ultracold atoms to the Bose-Einstein condensate (BEC) phase. We implement a model of atomic evaporation in a trapping potential, and we …
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Between order and disorder: ultracold atoms in a quasicrystalline optical lattice
… The field of quantum simulation with ultracold atoms offers a solution to this problem, namely the use of optical lattices – standing waves of light. Optical lattices are free of impurities and therefore ideally suited to study quasicrystals, enabling unprecedented access to …
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Ultracold molecules from ultracold atoms : interactions in sodium and lithium gas
… presents results from experiments in which ultracold Sodium-6 and Lithium-23 atomic gases were studied near a Feshbach resonance at high magnetic fields. The enhanced interactions between atoms in the presence of a molecular state enhance collisions, leading to inelastic decay and loss, …
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Spin Dynamics in a Tunable Heisenberg Magnet Realized with Ultracold Atoms
… spin-spin interactions. In this work we use ultracold atoms to implement the first quantum simulator for the anisotropic Heisenberg model, with fully adjustable anisotropy of nearest-neighbor spin-spin interactions (also called the XXZ model). We study spin dynamics in previously unexplored …
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Quantum coherence and magnetism in bosonic and fermionic gases of ultracold atoms
… studied in a strongly interacting Fermi gas of ultracold atoms. The observation of nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. Our observations imply that itinerant …
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Explorations of engineered bosonic systems in ultracold atoms, oscillator networks, quantum spin chains, and space
DSpace SAF Submission Ingestion Package generated from Vireo submission #21359 on 2025-03-28 at 14:25:59
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Quantum dynamics of ultracold atoms in inhomogeneous magnetic fields : from ground state atoms to Rydberg atoms
… is the investigation of the quantum dynamics of ultracold atoms in the presence of external inhomogeneous magnetic fields. We discuss the behavior of ground state atoms inside typical magnetic field configurations. Such atoms can be approximately treated as neutral point-like particles which …
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Ultracold bosons in optical lattices for quantum measurement and simulation
Ultracold atoms provide a platform that allows for pristine control of a physical system, and have found uses in both the fields 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 …
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