Classical and quantum filaments in the ground state of trapped dipolar Bose gases

Fabio Cinti and Massimo Boninsegni
Phys. Rev. A 96, 013627 – Published 26 July 2017

Abstract

We study, by quantum Monte Carlo simulations, the ground state of a harmonically confined dipolar Bose gas with aligned dipole moments and with the inclusion of a repulsive two-body potential of varying range. Two different limits can clearly be identified, namely, a classical one in which the attractive part of the dipolar interaction dominates and the system forms an ordered array of parallel filaments and a quantum-mechanical one, wherein filaments are destabilized by zero-point motion, and eventually the ground state becomes a uniform cloud. The physical character of the system smoothly evolves from classical to quantum mechanical as the range of the repulsive two-body potential increases. An intermediate regime is observed in which ordered filaments are still present, albeit forming different structures from the ones predicted classically; quantum-mechanical exchanges of indistinguishable particles across different filaments allow phase coherence to be established, underlying a global superfluid response.

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  • Received 29 March 2017

DOI:https://doi.org/10.1103/PhysRevA.96.013627

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Fabio Cinti*

  • National Institute for Theoretical Physics (NITheP), Stellenbosch 7600, South Africa and Institute of Theoretical Physics, Stellenbosch University, Stellenbosch 7600, South Africa

Massimo Boninsegni

  • Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2G7

  • *cinti@sun.ac.za

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Vol. 96, Iss. 1 — July 2017

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