文章基本信息

标题：Linear resistivity and Sachdev-Ye-Kitaev (SYK) spin liquid behavior in a quantum critical metal with spin-1/2 fermions
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作者：Peter Cha ; Nils Wentzell ; Olivier Parcollet 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2020
卷号：117
期号：31
页码：18341-18346
DOI：10.1073/pnas.2003179117
出版社：The National Academy of Sciences of the United States of America
摘要：“Strange metals” with resistivity depending linearly on temperature T down to low T have been a long-standing puzzle in condensed matter physics. Here, we consider a lattice model of itinerant spin- 1 / 2 fermions interacting via onsite Hubbard interaction and random infinite-ranged spin–spin interaction. We show that the quantum critical point associated with the melting of the spin-glass phase by charge fluctuations displays non-Fermi liquid behavior, with local spin dynamics identical to that of the Sachdev-Ye-Kitaev family of models. This extends the quantum spin liquid dynamics previously established in the large-M limit of S U ( M ) symmetric models to models with physical S U ( 2 ) spin- 1 / 2 electrons. Remarkably, the quantum critical regime also features a Planckian linear-T resistivity associated with a T-linear scattering rate and a frequency dependence of the electronic self-energy consistent with the marginal Fermi liquid phenomenology.
关键词：Planckian metals ; strange metals ; marginal Fermi liquid ; Sachdev-Ye-Kitaev models ; cuprate superconductors