Abstract
By using an unbiased quantum Monte Carlo method, we investigate the hard-core Bose-Hubbard model on a square lattice with the anisotropic dipole-dipole interaction. To study the effect of the anisotropy, dipole moments are assumed to be polarized in the y direction on the two-dimensional xy plane. To perform efficient simulations of long-range interacting systems, we use the worm algorithm with an O(N) Monte Carlo method. We obtain the ground-state phase diagram that includes a superfluid phase and a striped solid phase at half-filling as two main phases. In addition to these two main phases, we find a small region where there are multiple plateaus in the particle density for small hopping amplitudes. In this region, the number of plateaus increases as the system size increases. This indicates the appearance of numerous competing ground states due to frustrated interactions. In our simulations, we find no evidence of a supersolid phase.
| Original language | English |
|---|---|
| Article number | 063635 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 86 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2012 Dec 26 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Quantum phases of hard-core bosons on two-dimensional lattices with anisotropic dipole-dipole interaction. / Ohgoe, Takahiro; Suzuki, Takafumi; Kawashima, Naoki.
In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 86, No. 6, 063635, 26.12.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quantum phases of hard-core bosons on two-dimensional lattices with anisotropic dipole-dipole interaction
AU - Ohgoe, Takahiro
AU - Suzuki, Takafumi
AU - Kawashima, Naoki
PY - 2012/12/26
Y1 - 2012/12/26
N2 - By using an unbiased quantum Monte Carlo method, we investigate the hard-core Bose-Hubbard model on a square lattice with the anisotropic dipole-dipole interaction. To study the effect of the anisotropy, dipole moments are assumed to be polarized in the y direction on the two-dimensional xy plane. To perform efficient simulations of long-range interacting systems, we use the worm algorithm with an O(N) Monte Carlo method. We obtain the ground-state phase diagram that includes a superfluid phase and a striped solid phase at half-filling as two main phases. In addition to these two main phases, we find a small region where there are multiple plateaus in the particle density for small hopping amplitudes. In this region, the number of plateaus increases as the system size increases. This indicates the appearance of numerous competing ground states due to frustrated interactions. In our simulations, we find no evidence of a supersolid phase.
AB - By using an unbiased quantum Monte Carlo method, we investigate the hard-core Bose-Hubbard model on a square lattice with the anisotropic dipole-dipole interaction. To study the effect of the anisotropy, dipole moments are assumed to be polarized in the y direction on the two-dimensional xy plane. To perform efficient simulations of long-range interacting systems, we use the worm algorithm with an O(N) Monte Carlo method. We obtain the ground-state phase diagram that includes a superfluid phase and a striped solid phase at half-filling as two main phases. In addition to these two main phases, we find a small region where there are multiple plateaus in the particle density for small hopping amplitudes. In this region, the number of plateaus increases as the system size increases. This indicates the appearance of numerous competing ground states due to frustrated interactions. In our simulations, we find no evidence of a supersolid phase.
UR - http://www.scopus.com/inward/record.url?scp=84871738541&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871738541&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.86.063635
DO - 10.1103/PhysRevA.86.063635
M3 - Article
AN - SCOPUS:84871738541
VL - 86
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 6
M1 - 063635
ER -