16 8

Superfluid-insulator transitions of two-species bosons in an optical lattice

Title
Superfluid-insulator transitions of two-species bosons in an optical lattice
Author
차민철
Issue Date
2005-11
Publisher
AMERICAN PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v. 72, No. 18, Article no. 184507
Abstract
We consider the two-species bosonic Hubbard model with variable interspecies interaction and hopping strength in the grand canonical ensemble with a common chemical potential. We analyze the superfluid-insulator (SI) transition for the relevant parameter regimes and compute the ground state phase diagram in the vicinity of odd filling Mott states. We find that the superfluid-insulator transition occurs with (a) simultaneous onset of superfluidity of both species or (b) coexistence of Mott insulating state of one species and superfluidity of the other or, in the case of unit filling, (c) complete depopulation of one species. The superfluid-insulator transition can be first order in a large region of the phase diagram. We develop a variational mean-field method which takes into account the effect of second order quantum fluctuations on the superfluid-insulator transition and corroborate the mean-field phase diagram using a quantum Monte Carlo study.
URI
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.72.184507http://repository.hanyang.ac.kr/handle/20.500.11754/111931
ISSN
2469-9950; 2469-9969
DOI
10.1103/PhysRevB.72.184507
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
Files in This Item:
2005.11_차민철_Superfluid-insulator transitions of two-species bosons in an optical lattice.pdfDownload
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE