Quantum phases of dipolar soft-core bosons
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PhysRevA.90.043635.pdf
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817.18 KB
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Author(s)
Grimmer, D.
Capogrosso-Sansone, B.
Safavi-Naini, Arghavan
Soyler, S. G.
Date Issued
October 2014
Journal
Physical Review A
Publisher
American Physical Society
Citation
Grimmer, D., A. Safavi-Naini, B. Capogrosso-Sansone, and S. G. Soyler. “Quantum Phases of Dipolar Soft-Core Bosons.” Phys. Rev. A 90, no. 4 (October 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We study the phase diagram of a system of soft-core dipolar bosons confined to a two-dimensional optical lattice layer. We assume that dipoles are aligned perpendicular to the layer such that the dipolar interactions are purely repulsive and isotropic. We consider the full dipolar interaction and perform path-integral quantum Monte Carlo simulations using the worm algorithm. Besides a superfluid phase, we find various solid and supersolid phases. We show that, unlike what was found previously for the case of nearest-neighbor interaction, supersolid phases are stabilized by doping the solids not only with particles but with holes as well. We further study the stability of these quantum phases against thermal fluctuations. Finally, we discuss pair formation and the stability of the pair checkerboard phase formed in a bilayer geometry, and we suggest experimental conditions under which the pair checkerboard phase can be observed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.90.043635
