Superfluidity versus localization of two-dimensional hard-core boson model: a quantum Monte Carlo study
✍ Scribed by T. Onogi; Y. Murayama
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 156 KB
- Volume
- 194-196
- Category
- Article
- ISSN
- 0921-4526
No coin nor oath required. For personal study only.
✦ Synopsis
Quantum Monte Carlo simulations are used to investigate two-dimensional superfluidity of the hard-core boson model, that depends on particle density and disorder. It is definitely found that the clean system at half filling becomes superfluid via finite temperature Kosterlitz-Thouless transition. The low temperature superfluid density, as a function of particle density, displays a symmetric and parabolic shape about half filling. Disorder alters the superfluid phase into two distinct localized phases, depending on particle density. The universal relationship between Tc and carrier-density, as experimentally reported for high-Tc superconductors, appears to correlate with the computational result.