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Quasiparticle gap in a disordered boson Hubbard model in two dimensions

Title
Quasiparticle gap in a disordered boson Hubbard model in two dimensions
Author
차민철
Issue Date
2005-12
Publisher
AMERICAN PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v. 72, No. 21, Article no. 212515
Abstract
We investigate the behavior of the quasiparticle energy gap near quantum phase transitions in a two-dimensional disordered boson Hubbard model at a commensurate filling. Via Monte Carlo simulations of ensembles with fixed numbers of particles, we observe the behavior of the gap as a function of the tuning parameter for various strengths of diagonal disorder. For weak disorder, we find that gapped Mott insulating phase is sustained up to the transition point and disappears only in a superfluid, strongly supporting a direct Mott-insulator-to-superfluid transition. Bose glass behavior, insulating with vanishing gap, appears only when the strength of disorder is bigger than a critical value.
URI
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.72.212515http://repository.hanyang.ac.kr/handle/20.500.11754/112000
ISSN
2469-9950; 2469-9969
DOI
10.1103/PhysRevB.72.212515
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
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