Superfluid phases induced by dipolar interactions

Rebecca Kraus, Krzysztof Biedroń, Jakub Zakrzewski, and Giovanna Morigi
Phys. Rev. B 101, 174505 – Published 6 May 2020

Abstract

We determine the quantum ground state of dipolar bosons in a quasi-one-dimensional optical lattice and interacting via s-wave scattering. The Hamiltonian is an extended Bose-Hubbard model which includes hopping terms due to the interactions. We identify the parameter regime for which the coefficients of the interaction-induced hopping terms become negative. For these parameters we numerically determine the phase diagram for a canonical ensemble and by means of density matrix renormalization group. We show that at sufficiently large values of the dipolar strength there is a quantum interference between the tunneling due to single-particle effects and the one due to the interactions. Because of this phenomenon, incompressible phases appear at relatively large values of the single-particle tunneling rates. This quantum interference cuts the phase diagram into two different, disconnected superfluid phases. In particular, at vanishing kinetic energy, the phase is always superfluid with a staggered superfluid order parameter. These dynamics emerge from quantum interference phenomena between quantum fluctuations and interactions and shed light into their role in determining the thermodynamic properties of quantum matter.

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  • Received 6 February 2020
  • Revised 27 March 2020
  • Accepted 13 April 2020

DOI:https://doi.org/10.1103/PhysRevB.101.174505

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Rebecca Kraus1, Krzysztof Biedroń2, Jakub Zakrzewski2,3, and Giovanna Morigi1

  • 1Theoretical Physics, Saarland University, Campus E2.6, D–66123 Saarbrücken, Germany
  • 2Institute of Theoretical Physics, Jagiellonian University in Krakow, ul. Lojasiewicza 11, 30-348 Kraków, Poland
  • 3Mark Kac Complex Systems Research Center, Jagiellonian University in Krakow, Łojasiewicza 11, 30-348 Kraków, Poland

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Issue

Vol. 101, Iss. 17 — 1 May 2020

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