Tuning the Kosterlitz-Thouless transition to zero temperature in anisotropic boson systems

Jhih Shih You*, Hao Lee, Shiang Fang, Miguel A. Cazalilla, Daw Wei Wang

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

We study the two-dimensional Bose-Hubbard model with anisotropic hopping. Focusing on the effects of anisotropy on superfluid properties such as the helicity modulus and the normal-to-superfluid [Berezinskii-Kosterlitz-Thouless (BKT)] transition temperature, two different approaches are compared: large-scale quantum Monte Carlo simulations and the self-consistent harmonic approximation (SCHA). For the latter, two different formulations are considered, one applying near the isotropic limit and the other applying in the extremely anisotropic limit. Thus we find that the SCHA provides a reasonable description of superfluid properties of this system provided the appropriate type of formulation is employed. The accuracy of the SCHA in the extremely anisotropic limit, where the BKT transition temperature is tuned to zero (i.e., at a quantum critical point) and therefore quantum fluctuations play a dominant role, is particularly striking.

原文英語
文章編號043612
期刊Physical Review A - Atomic, Molecular, and Optical Physics
86
發行號4
DOIs
出版狀態已發佈 - 2012 10月 10
對外發佈

ASJC Scopus subject areas

  • 原子與分子物理與光學

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