We numerically study a model of interacting spin-1/2 electrons with random exchange coupling on a fully connected lattice. This model hosts a quantum critical point separating two distinct metallic phases as a function of doping: a Fermi liquid phase with a large Fermi surface volume and a low-doping phase with local moments ordering into a spin-glass. We show that this quantum critical point has non-Fermi liquid properties characterized by T-linear Planckian behavior, ω/T scaling and slow spin dynamics of the Sachdev-Ye-Kitaev (SYK) type. The ω/T scaling function associated with the electronic self-energy is found to have an intrinsic particle-hole asymmetry, a hallmark of a `skewed' non-Fermi liquid.
@article{arxiv.2103.08607,
title = {Planckian Metal at a Doping-Induced Quantum Critical Point},
author = {Philipp T. Dumitrescu and Nils Wentzell and Antoine Georges and Olivier Parcollet},
journal= {arXiv preprint arXiv:2103.08607},
year = {2022}
}
Comments
6+11 pages; 4+10 figures; v2. improves data analysis, expands appendix, increases convergence of data, updates all figures