论文标题
奇怪的金属作为Ersatz Fermi液体
Strange metals as ersatz Fermi liquids
论文作者
论文摘要
相关电子物理学中基本重要性的长期存在的神秘之选是要理解在多种量子材料中看到的奇怪的非Fermi液体金属。这些金属的惊人实验特征是电阻率在温度下是线性的（$ t $）。在本文中，我们询问在翻译不变金属中获得这种非Fermi液体物理学的温度需要什么。如果此外，如果全频率（$ω$）依赖电导率满足$ω/t $缩放率，我们认为$ t $ - 线性电阻率必须来自低能固定点的内在物理。结合较早的论点，即可压缩的翻译金属是“ Ersatz fermi液体”，并具有无限数量的新兴保守量，我们得出了强大而实用的结论。我们表明，在反转/时间逆转对称性下，对操作员的敏感性一定有不同的敏感性，并且晶体动量为零。我们讨论了我们的论点的其他一些实验后果，以及潜在的漏洞，这些漏洞必然意味着其他外来现象。
A long standing mystery of fundamental importance in correlated electron physics is to understand strange non-Fermi liquid metals that are seen in diverse quantum materials. A striking experimental feature of these metals is a resistivity that is linear in temperature ($T$). In this paper we ask what it takes to obtain such non-Fermi liquid physics down to zero temperature in a translation invariant metal. If in addition the full frequency ($ω$) dependent conductivity satisfies $ω/T$ scaling, we argue that the $T$-linear resistivity must come from the intrinsic physics of the low energy fixed point. Combining with earlier arguments that compressible translation invariant metals are `ersatz Fermi liquids' with an infinite number of emergent conserved quantities, we obtain powerful and practical conclusions. We show that there is necessarily a diverging susceptibility for an operator that is odd under inversion/time reversal symmetries, and has zero crystal momentum. We discuss a few other experimental consequences of our arguments, as well as potential loopholes which necessarily imply other exotic phenomena.
