• Open Access

Interaction-induced effects on Bose-Hubbard parameters

Mark Kremer, Rashi Sachdeva, Albert Benseny, and Thomas Busch
Phys. Rev. A 96, 063611 – Published 8 December 2017

Abstract

We study the effects of repulsive on-site interactions on the broadening of the localized Wannier functions used for calculating the parameters to describe ultracold atoms in optical lattices. For this, we replace the common single-particle Wannier functions, which do not contain any information about the interactions, by two-particle Wannier functions obtained from an exact solution which takes the interactions into account. We then use these interaction-dependent basis functions to calculate the Bose-Hubbard model parameters, showing that they are substantially different both at low and high lattice depths from the ones calculated using single-particle Wannier functions. Our results suggest that density effects are not negligible for many parameter ranges and need to be taken into account in metrology experiments.

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  • Received 31 July 2017

DOI:https://doi.org/10.1103/PhysRevA.96.063611

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Mark Kremer1, Rashi Sachdeva2,*, Albert Benseny2, and Thomas Busch2

  • 1Institut für Physik, Universität Rostock, Albert-Einstein-Strasse 23, 18059 Rostock, Germany
  • 2Quantum Systems Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan

  • *rashi.sachdeva@oist.jp

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Vol. 96, Iss. 6 — December 2017

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