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Thomas Pohl

Exchange-induced crystallization of soft-core bosons

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  • Fabio Cinti, Stellenbosch University
  • ,
  • Massimo Boninsegni, University of Alberta
  • ,
  • Thomas Pohl

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 He-4, 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.

Original languageEnglish
Article number033038
JournalNew Journal of Physics
Number of pages9
Publication statusPublished - 28 Mar 2014
Externally publishedYes

    Research areas

  • soft-core bosons, quantum phase transitions, cold atoms, quantum Monte Carlo simulations, SUPERFLUID, TRANSITION, CRYSTALS, PHYSICS, ATOMS, GAS

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