Tunable non-Fermi liquid phase from coupling to two-level systems
Abstract
We study a controlled large- theory of electrons coupled to dynamical two-level systems (TLSs) via spatially-random interactions. Such a physical situation arises when electrons scatter off low-energy excitations in a metallic glass, such as a charge or stripe glass. Our theory is governed by a non-Gaussian saddle point, which maps to the celebrated spin-boson model. By tuning the coupling strength we find that the model crosses over from a Fermi liquid at weak coupling to an extended region of non-Fermi liquid behavior at strong coupling, and realizes a marginal Fermi liquid at the crossover. Beyond a critical coupling strength, the TLSs freeze and Fermi-liquid behavior is restored. Our results are valid for generic space dimensions .
Cite
@article{arxiv.2310.07768,
title = {Tunable non-Fermi liquid phase from coupling to two-level systems},
author = {Noga Bashan and Evyatar Tulipman and Jörg Schmalian and Erez Berg},
journal= {arXiv preprint arXiv:2310.07768},
year = {2024}
}
Comments
4.5 + 3 pages, 3 figures