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Abstract: We study finite-temperature phase transitions in a two-dimensional bosonHubbard model with zero-point quantum fluctuations via Monte Carlo simulationsof quantum rotor model, and construct the corresponding phase diagram.Compressibility shows a thermally activated gapped behavior in the insulatingregime. Finite-size scaling of the superfluid stiffness clearly shows thenature of the Kosterlitz-Thouless transition. The transition temperature,$T c$, confirms a scaling relation $T c \propto ho 0^x$ with $x=1.0$. Someevidences of anomalous quantum behavior at low temperatures are presented.



Author: Min-Chul Cha, Ji-Woo Lee

Source: https://arxiv.org/



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