Classical and quantum filaments in the ground state of trapped dipolar Bose gases
Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
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.
Description
CITATION: Cinti, F. & Boninsegni, M. 2017. Classical and quantum filaments in the ground state of trapped dipolar Bose gases. Physical Review A, 96(1):013627, doi:10.1103/PhysRevA.96.013627.
The original publication is available at http://journals.aps.org/pra
The original publication is available at http://journals.aps.org/pra
Keywords
Dipolar gases, Quantum filaments, Classical filaments, Quantum Monte Carlo (QMC), Bose–Einstein condensate (BEC)
Citation
Cinti, F. & Boninsegni, M. 2017. Classical and quantum filaments in the ground state of trapped dipolar Bose gases. Physical Review A, 96(1):013627, doi:10.1103/PhysRevA.96.013627