Optical lattices as a tool to study defect-induced superfluidity

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.

14 pages, 13 figures, published version

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Cited by in corpus (8)

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• Universal off-diagonal long-range order behaviour for a trapped Tonks-Girardeau gas
• Static and dynamic phases of a Tonks-Girardeau gas in an optical lattice
• Commensurate and incommensurate 1D interacting quantum systems
• Spread and asymmetry of typical quantum coherence and their inhibition in response to glassy disorder
• Quantum Monte Carlo study of strongly interacting bosonic one-dimensional systems in periodic potentials