Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.86.043612
Title: Tuning the Kosterlitz-Thouless transition to zero temperature in anisotropic boson systems
Authors: You, J.-S.
Lee, H.
Fang, S.
Cazalilla, M.A. 
Wang, D.-W.
Issue Date: 10-Oct-2012
Citation: You, J.-S., Lee, H., Fang, S., Cazalilla, M.A., Wang, D.-W. (2012-10-10). Tuning the Kosterlitz-Thouless transition to zero temperature in anisotropic boson systems. Physical Review A - Atomic, Molecular, and Optical Physics 86 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.86.043612
Abstract: 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. © 2012 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/126663
ISSN: 10502947
DOI: 10.1103/PhysRevA.86.043612
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