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Phase Transitions in a Hard-Core Boson Model in Two Dimensions

Title
Phase Transitions in a Hard-Core Boson Model in Two Dimensions
Author
차민철
Keywords
quantum Monte Carlo; hard-core bosons; quantum phase transitions
Issue Date
2008-02
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v. 52, Page. S162-S165
Abstract
We study quantum phase transitions of a hard-core boson model with nearest-neighbor repulsion in two dimensions. By tuning chemical potential at a fixed hopping strength, the system undergoes a phase transition from solid phase to superfluid phase. Via quantum Monte Carlo with directed loop algorithm, we find that there is hysteresis in density of bosons as a function of chemical potential. This result is reinforced by the analysis of the histogram of density near the transition, where we obtain two peaks. Our result confirms that the transition is of the first order and we find no sign of a macroscopic supersolid state.
URI
http://www.jkps.or.kr/journal/view.html?uid=9543&vmd=Fullhttp://repository.hanyang.ac.kr/handle/20.500.11754/76793
ISSN
0374-4884
DOI
10.3938/jkps.52.162
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
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