Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-03
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 7 figures
Scientific paper
10.1103/PhysRevLett.98.266406
We study finite-temperature phase transitions in a two-dimensional boson Hubbard model with zero-point quantum fluctuations via Monte Carlo simulations of quantum rotor model, and construct the corresponding phase diagram. Compressibility shows a thermally activated gapped behavior in the insulating regime. Finite-size scaling of the superfluid stiffness clearly shows the nature of the Kosterlitz-Thouless transition. The transition temperature, $T_c$, confirms a scaling relation $T_c \propto \rho_0^x$ with $x=1.0$. Some evidences of anomalous quantum behavior at low temperatures are presented.
Cha Min-Chul
Lee Ji-Woo
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