Nematic phases and elastoresistivity from a multiorbital non-Fermi liquid.
Proc Natl Acad Sci U S A 2023;
120:e2207903120. [PMID:
36603030 PMCID:
PMC9926168 DOI:
10.1073/pnas.2207903120]
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Abstract
We propose and study a two-orbital lattice extension of the Sachdev-Ye-Kitaev model in the large-N limit. The phase diagram of this model features a high-temperature isotropic non-Fermi liquid which undergoes first-order thermal transition into a nematic insulator or continuous thermal transition into a nematic metal phase, separated by a tunable tricritical point. These phases arise from spontaneous partial orbital polarization of the multiorbital non-Fermi liquid. We explore the spectral and transport properties of this model, including d.c. elastoresistivity, which exhibits a peak near nematic transition, as well as nonzero frequency elastoconductivity. Our work offers a useful perspective on nematic phases and transport in correlated multiorbital systems.
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