量子临界金属的Specific Heat
Specific Heat of a Quantum Critical Metal
摘要：
利用无符号问题的量子蒙特卡罗模拟研究了Ising量子临界点（QCP）附近的比热$c$.冷却对QCP，我们发现一个广泛的制度的温度，其中$c/T$是接近预期的值从非相互作用的能带结构，即使是一个适度大的耦合强度。在较低的温度下，我们观察到$c/T$的快速上升，然后随着系统变得超导而下降到零。自旋磁化率在$c/T$增强开始的大致相同的温度下开始下降，最有可能是由于与超导波动相关的能隙的打开。这些发现表明，超导性和非费米液体行为（表现在有效质量的增强）在可比的能量尺度开始。我们支持这些结论与分析微扰计算。
英文摘要：
We investigate the specific heat, $c$, near an Ising nematic quantum critical point (QCP), using sign problem-free quantum Monte Carlo simulations. Cooling towards the QCP, we find a broad regime of temperature where $c/T$ is close to the value expected from the non-interacting band structure, even for a moderately large coupling strength. At lower temperature, we observe a rapid rise of $c/T$, followed by a drop to zero as the system becomes superconducting. The spin susceptibility begins to drop at roughly the same temperature where the enhancement of $c/T$ onsets, most likely due to the opening of a gap associated with superconducting fluctuations. These findings suggest that superconductivity and non-Fermi liquid behavior (manifested in an enhancement of the effective mass) onset at comparable energy scales. We support these conclusions with an analytical perturbative calculation.
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