Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session B07: Non-Fermi Liquid Transport
11:30 AM–1:54 PM,
Monday, March 4, 2024
Room: L100H
Sponsoring
Unit:
DCMP
Chair: Elio König, Max-Planck-Institute for Solid State Research
Abstract: B07.00003 : Theory of shot noise in strange metals
11:54 AM–12:06 PM
Presenter:
Alexander Nikolaenko
(Harvard university)
Authors:
Alexander Nikolaenko
(Harvard university)
Subir Sachdev
(Harvard University)
Aavishkar A Patel
(Flatiron Institute)
We extend the theory of shot noise in coherent metals to shot noise in strange metals without quasiparticle excitations. This requires a generalization of the Boltzmann equation with a noise source to distribution functions which depend independently on the excitation momentum and energy. We apply this theory to a model of a strange metal with linear in temperature (T) resistivity, describing a Fermi surface with a spatially random Yukawa coupling to a critical boson. We find a suppression of the Fano factor in the strange metal, and describe the dependence of the shot noise on temperature and applied voltage. At low temperatures, we obtain a Fano factor equal to 1/6, in contrast to the 1/3 Fano factor in diffusive metals with quasiparticles. Our results are in general agreement with recent observations by Chen et al. (arXiv:2206.00673). We further compare the random Yukawa model to quasi-elastic electron-phonon scattering that also generates T-linear resistivity, and argue that shot noise observations offer a useful diagnostic to distinguish between them.
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