Superconducting vortex lattices for ultracold atoms.

Quantum Coherent Phenomena in Superconducting Circuits and Ultracold Atoms

Title of dissertation: QUANTUM COHERENT PHENOMENA IN SUPERCONDUCTING CIRCUITS AND ULTRACOLD ATOMS Kaushik Mitra, Doctor of Philosophy, 2010 Dissertation directed by: Professor Christopher Lobb Department of Physics This thesis consists of theoretical studies of superconducting qubits, and trapped bosons and fermions at ultracold temperature. In superconducting qubits I analyze the resonant prop...

Superconducting atom chips: advantages and challenges

Superconductors are considered in view of applications to atom chip devices. The main features of magnetic traps based on superconducting wires in the Meissner and mixed states are discussed. The former state may mainly be interesting for improved atom optics, while in the latter, cold atoms may provide a probe of superconductor phenomena. The properties of a magnetic side guide based on a sing...

Exotic superconducting phases of ultracold atom mixtures on triangular lattices

Rotating states for trapped bosons in an optical lattice

Rotational states for trapped bosons in an optical lattice are studied in the framework of the Hubbard model. Critical frequencies are calculated and the main parameter regimes are identified. Transitions are observed from edge superfluids to vortex lattices with Mott insulating cores, and subsequently to lattices of interstitial vortices. The former transition coincides with the Mott transitio...

Effect of vortices on the spin-flip lifetime of atoms in superconducting atom-chips

We study theoretically the lifetime of magnetically trapped atoms in the close vicinity of a type-II superconducting surface, in the context of superconducting atom-chips. We account for the magnetic noise created at the cloud position by the vortices present in the superconductor and give specific results for our experiment which uses a niobium film. Our main result is that atom losses are dom...