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首页> 外文期刊>Physical review >Specific heat maximum as a signature of Mott physics in the two-dimensional Hubbard model
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Specific heat maximum as a signature of Mott physics in the two-dimensional Hubbard model

机译：特定的热量为二维哈贝德模型中的Mott物理签名

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摘要

Recent experiments on cuprates show that as a function of doping, the normal-state specific heat sharply peaks at the doping delta*, where the pseudogap ends at low temperature. This finding is taken as the thermodynamic signature of a quantum critical point, whose nature has not yet been identified. Here we present calculations for the two-dimensional Hubbard model in the doped Mott insulator regime, which indicate that the specific heat anomaly can arise from the finite-temperature critical end point of a first-order transition between a pseudogap phase with dominant singlet correlations and a metal. As a function of doping at the temperature of the end point, the specific heat diverges. Upon increasing temperature, the peak becomes broader. The diverging correlation length is associated with uniform density fluctuations. No broken symmetries are needed. These anomalies also occur at half-filling as a function of interaction strength, and are relevant for organic superconductors and ultracold atoms.
机译：最近对铜酸盐酯的实验表明，作为掺杂的函数，掺杂δ*处的正常状态特异性热峰值尖锐，其中伪焦点在低温下结束。该发现被视为量子临界点的热力学签名，其性质尚未被识别。在这里，我们在掺杂的Mott绝缘体制度中向二维喧哗模型提供计算，这表明特定的热异常可以从伪转换与主题单次相关的伪转换之间的一阶转变的有限临界终点。金属。作为掺杂在终点的温度下的函数，具体的热分流。在升高温度时，峰变宽。发散相关长度与均匀的密度波动相关。不需要破坏的对称性。这些异常也以相互作用强度的函数的半填充，并且与有机超导体和超级原子相关。

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  • 来源
    《Physical review》 |2019年第12期|121105.1-121105.6|共6页
  • 作者

    Sordi G.; Walsh C.; Semon P.; Tremblay A-M S.;

  • 作者单位

    Royal Holloway Univ London Dept Phys Egham TW20 0EX Surrey England;

    Royal Holloway Univ London Dept Phys Egham TW20 0EX Surrey England;

    Brookhaven Natl Lab Computat Sci Initiat Upton NY 11973 USA;

    Univ Sherbrooke Dept Phys & Inst Quant Sherbrooke PQ J1K 2R1 Canada|Canadian Inst Adv Res Toronto ON M5G 1Z8 Canada;

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