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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2020

Linear resistivity and Sachdev-Ye-Kitaev (SYK) spin liquid behaviour in a quantum critical metal with spin-1/2 fermions

Résumé

“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 $SU (M)$ symmetric models to models with physical $SU (2)$ 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.
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cea-04541041 , version 1 (22-04-2024)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Peter Cha, Nils Wentzell, Olivier Parcollet, Antoine Georges, Eun-Ah Kim. Linear resistivity and Sachdev-Ye-Kitaev (SYK) spin liquid behaviour in a quantum critical metal with spin-1/2 fermions. Proceedings of the National Academy of Sciences of the United States of America, 2020, 117 (31), pp.18341-18346. ⟨10.1073/pnas.2003179117⟩. ⟨cea-04541041⟩
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