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arXiv 2101.07201cond-mat.str-el
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朗道准粒子在接近Mott跃迁时的涨落

Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition

Andrej Pustogow, Yohei Saito, Anja Löhle, Miriam Sanz Alonso, Atsushi Kawamoto, Vladimir Dobrosavljević, Martin Dressel, Simone Fratini

摘要:

朗道认为,金属的低温性质可以用长寿命准粒子来理解,所有复杂的相互作用都包含在费米液体参数中,比如有效质量$m^{\star}$。尽管其广泛的适用性,电子输运坏或奇怪的金属和非常规超导体是有争议的讨论可能崩溃的准粒子概念。在这里,我们探讨了在接近莫特绝缘体的相关金属在半填充不同的相关强度的电动力学响应。我们揭示了持久的费米液体的行为与显着的二次依赖的光散射率对温度和频率,以及令人费解的弹性松弛的贡献。超过Ioffe-Regel-Mott极限的电阻率的强烈增加伴随着光导性中的“位移Drude峰”。我们的研究结果,支持的光学响应的理论模型,表明出现了一个坏的金属从弹性准粒子,受到动态本地化和溶解附近的莫特过渡。

英文摘要:

Landau suggested that the low-temperature properties of metals can be understood in terms of long-lived quasiparticles with all complex interactions included in Fermi-liquid parameters, such as the effective mass $m^{\star}$. Despite its wide applicability, electronic transport in bad or strange metals and unconventional superconductors is controversially discussed towards a possible collapse of the quasiparticle concept. Here we explore the electrodynamic response of correlated metals at half filling for varying correlation strength upon approaching a Mott insulator. We reveal persistent Fermi-liquid behavior with pronounced quadratic dependences of the optical scattering rate on temperature and frequency, along with a puzzling elastic contribution to relaxation. The strong increase of the resistivity beyond the Ioffe-Regel-Mott limit is accompanied by a `displaced Drude peak' in the optical conductivity. Our results, supported by a theoretical model for the optical response, demonstrate the emergence of a bad metal from resilient quasiparticles that are subject to dynamical localization and dissolve near the Mott transition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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