Exchange-induced crystallization of soft-core bosons
Date
2014-03-28
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Physics
Abstract
We study the phase diagram of a two-dimensional assembly of bosons interacting
via a soft-core repulsive pair potential of varying strength, and compare it
to that of the equivalent system in which particles are regarded as distinguishable.
We show that quantum-mechanical exchanges stabilize a ‘cluster crystal’
phase in a wider region of parameter space than predicted by calculations in
which exchanges are neglected. This physical effect is diametrically opposite to
that which takes place in hard-core Bose systems such as 4He, wherein
exchanges strengthen the fluid phase. This is underlain in the cluster crystal
phase of soft-core bosons by the free energy gain associated with the formation
of local Bose–Einstein condensates.
Description
CITATION: Cinti, F., Boninsegni, M. & Pohl, T. 2014. Exchange-induced crystallization of soft-core bosons. New Journal of Physics, 16:033038, doi:10.1088/1367-2630/16/3/033038.
The original publication is available at http://iopscience.iop.org/journal/1367-2630
The original publication is available at http://iopscience.iop.org/journal/1367-2630
Keywords
Soft-core bosons, Quantum phase transitions, Quantum Monte Carlo simulations, Cold atoms
Citation
Cinti, F., Boninsegni, M. & Pohl, T. 2014. Exchange-induced crystallization of soft-core bosons. New Journal of Physics, 16:033038, doi:10.1088/1367-2630/16/3/033038.