Universal theory of strange metals from spatially random interactions

• 成果类型: Article
• 署名作者: Patel, Aavishkar A.; Guo, Haoyu; Esterlis, Ilya; Sachdev, Subir
• 署名单位: Simons Foundation; Flatiron Institute; University of California System; University of California Berkeley; Cornell University; Harvard University; University of California System; University of California Santa Barbara; University of Wisconsin System; University of Wisconsin Madison; Institute for Advanced Study - USA
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13513
• DOI: 10.1126/science.abq6011
• 发表日期: 2023-08-18
• 页码: 790-793
• 关键词: temperature; state

摘要

Strange metals-ubiquitous in correlated quantum materials-transport electrical charge at low temperatures but not by the individual electronic quasiparticle excitations, which carry charge in ordinary metals. In this work, we consider two-dimensional metals of fermions coupled to quantum critical scalars, the latter representing order parameters or fractionalized particles. We show that at low temperatures (T), such metals generically exhibit strange metal behavior with a T-linear resistivity arising from spatially random fluctuations in the fermion-scalar Yukawa couplings about a nonzero spatial average. We also find a T ln(1/T) specific heat and a rationale for the Planckian bound on the transport scattering time. These results are in agreement with observations and are obtained in the large N expansion of an ensemble of critical metals with N fermion flavors.