Dimensional crossover in bose-hubbard model.

We used quantum Monte Carlo simulation to investigate the dimensional crossover in the Bose-Hubbard model when the inter layer coupling Jp was reduced from 1 to 0. In particular, the evolution of the superfluid transition was studied. We found that the critical temperature of phase transition dec...

Full description

Saved in:
Bibliographic Details
Main Author: Zhang, Zhifeng.
Other Authors: School of Physical and Mathematical Sciences
Format: Final Year Project
Language:English
Published: 2011
Subjects:
Online Access:http://hdl.handle.net/10356/44546
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
Description
Summary:We used quantum Monte Carlo simulation to investigate the dimensional crossover in the Bose-Hubbard model when the inter layer coupling Jp was reduced from 1 to 0. In particular, the evolution of the superfluid transition was studied. We found that the critical temperature of phase transition decreases monotonically with Jp and the system started to have a 2-D behavior when Jp < 0.04. The critical temperature eventually converged to the critical temperature (Tc = 0.79(1)) of the 2-D Berezinsky-Kosterlitz- Thouless transition. The dimensional crossover was observed.