Quantum Monte Carlo simulations of thermodynamic properties of SU(2N) ultracold fermions in optical lattices

Zhichao Zhou, Zi Cai, Congjun Wu, and Yu Wang
Phys. Rev. B 90, 235139 – Published 22 December 2014

Abstract

We have systematically studied the thermodynamic properties of a two-dimensional half-filled SU(2N) Hubbard model on a square lattice by using the determinant quantum Monte Carlo method. The entropy-temperature relation, the isoentropy curve, and the probability distribution of the on-site occupation number are calculated in both SU(4) and SU(6) cases, which exhibit prominent features of the Pomeranchuk effect. We analyze these thermodynamic behaviors based on energy scales in the density and spin channels. In the density channel, the interaction strength that marks the crossover from the weak to strong interaction regimes increases with the number of fermion components. In the spin channel, increasing the number of fermion components enhances quantum spin fluctuations, which is shown in the simulations of uniform spin susceptibilities and antiferromagnetic structure factors.

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  • Received 22 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.235139

©2014 American Physical Society

Authors & Affiliations

Zhichao Zhou1, Zi Cai2, Congjun Wu3, and Yu Wang1,*

  • 1School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 2Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020 Innsbruck, Austria
  • 3Department of Physics, University of California, San Diego, California 92093, USA

  • *yu.wang@whu.edu.cn

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Vol. 90, Iss. 23 — 15 December 2014

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