标题： 关于“有机电荷转移材料中的超导性和莫特物理” 显示英文标题

标题： Comment on "Superconductivity and Mott Physics in Organic Charge Transfer Materials"

摘要： Menke 等人最近声称，$\kappa$相有机电荷转移固体 (CTS) 中的超导性 (SC) 可以用二维半填充各向异性三角晶格 Hubbard 模型来理解。 实验表明，$\kappa$-CTS 在环境压力下大多（但并非总是）呈现反铁磁 (AFM) 状态，而在压力下则会出现超导。 与这一观察结果明显一致的是，Menke 等人在 AFM 和费米液体基态界面的一小块区域内发现了较小的 $t/U$ 下的 AFM 基态，并且随着 $t/U$ 的增加，在 $t'/t$ 固定的情况下，$U$ 为 Hubbard 斥力，出现超导。 Menke 等人的计算结果与使用精确对角化和路径积分重正化群方法获得的结果直接矛盾。 确定这种差异的根源显然意义重大，尤其是考虑到以下事实：(a) 相关论点在铜酸盐超导（但这涉及掺杂）的背景下仍然存在；(b) 存在电荷不均等相 (CTS)，其中超导并不接近原子力显微镜 (AFM)，而是由一个中间电荷不均等相分隔。 本文我们表明，Menke 等人关于超导的结论是错误的，并且源于一个有缺陷的假设。 显示英文摘要

摘要： Menke et al. recently claimed that superconductivity (SC) in the $\kappa$-phase organic charge-transfer solids (CTS) can be understood within the two-dimensional half-filled anisotropic triangular-lattice Hubbard model. Experimentally, $\kappa$-CTS are mostly but not always antiferromagnetic (AFM) at ambient pressure and SC appears under pressure. In apparent agreement with this observation, Menke et al. found AFM ground states for small $t/U$ and SC over a small region at the interface of AFM and Fermi liquid ground states with increasing $t/U$ at fixed $t'/t$, where $U$ is the Hubbard repulsion. Menke et al's computational results directly contradict those obtained using exact diagonalization and Path Integral Renormalization Group approaches. It is clearly of interest to determine the origin of this discrepancy, especially in view of the facts that (a) related arguments continue to persist in the context of cuprate SC superconductivity (which however involves doping), and (b) there exist CTS in which SC is not proximate to AFM, but is separated by an intermediate charge-disproportionated phase. Here we show that Menke et al's conclusion regarding SC is incorrect and originates from a flawed assumption.