Optical lattices as a tool to study defect-induced superfluidity
Quantum Gases
2017-09-07 v2
Abstract
We study the superfluid response, the energetic and structural properties of a one-dimensional ultracold Bose gas in an optical lattice of arbitrary strength. We use the Bose-Fermi mapping in the limit of infinitely large repulsive interaction and the diffusion Monte Carlo method in the case of finite interaction. For slightly incommensurate fillings we find a superfluid behavior which is discussed in terms of vacancies and interstitials. It is shown that both the excitation spectrum and static structure factor are different for the cases of microscopic and macroscopic fractions of defects. This system provides a extremely well-controlled model for studying defect-induced superfluidity.
Keywords
Cite
@article{arxiv.1612.07690,
title = {Optical lattices as a tool to study defect-induced superfluidity},
author = {Grigory E. Astrakharchik and Konstantin V. Krutitsky and Maciej Lewenstein and Ferran Mazzanti and Jordi Boronat},
journal= {arXiv preprint arXiv:1612.07690},
year = {2017}
}
Comments
14 pages, 13 figures, published version