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arXiv 1405.4512cond-mat.str-el
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无限维哈伯德模型中相变线的估计

Estimate of the Phase Transition Line in the Infinite-dimensional Hubbard Model

Aaram J. Kim, M. Y. Choi, Gun Sang Jeon

摘要:

我们考虑无限维哈伯德模型的Mott跃迁。采用动态平均场论与连续时间量子蒙特卡罗(CTQMC)方法相结合,在低温下进行准确的描述。根据CTQMC方法直接测量的双占据和能量密度,我们构建了相图。我们特别注意在金属相和绝缘相共存区的一级相变线(PTL)的构造。由此产生的PTL被发现表现出合理的协议与早期的有限温度的结果。我们还表明,通过系统地包含低温数据的PTL,这是独立于以前的零温度的结果,单调地接近从早期的零温度研究的转变点。

英文摘要:

We consider a Mott transition of the Hubbard model in infinite dimensions. The dynamical mean- field theory is employed in combination with a continuous-time quantum Monte Carlo (CTQMC) method for an accurate description at low temperatures. From the double occupancy and the energy density, which are directly measured from the CTQMC method, we construct the phase diagram. We pay particular attention to the construction of the first-order phase transition line (PTL) in the co- existence region of metallic and insulating phases. The resulting PTL is found to exhibit reasonable agreement with earlier finite-temperature results. We also show by a systematic inclusion of low- temperature data that the PTL, which is achieved independently of the previous zero-temperature results, approaches monotonically the transition point from earlier zero-temperature studies.

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