Universität zu Köln

Driskell, George, Lederer, Samuel, Bauer, Carsten, Trebst, Simon and Kim, Eun-Ah (2021). Identification of Non-Fermi Liquid Physics in a Quantum Critical Metal via Quantum Loop Topography. Phys. Rev. Lett., 127 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Non-Fermi liquid physics is ubiquitous in strongly correlated metals, manifesting itself in anomalous transport properties, such as a T-linear resistivity in experiments. However, its theoretical understanding in terms of microscopic models is lacking, despite decades of conceptual work and attempted numerical simulations. Here we demonstrate that a combination of sign-problem-free quantum Monte Carlo sampling and quantum loop topography, a physics-inspired machine-learning approach, can map out the emergence of non-Fermi liquid physics in the vicinity of a quantum critical point (QCP) with little prior knowledge. Using only three parameter points for training the underlying neural network, we are able to robustly identify a stable non-Fermi liquid regime tracing the fans of metallic QCPs at the onset of both spin-density wave and nematic order. In particular, we establish for the first time that a spin-density wave QCP commands a wide fan of non-Fermi liquid region that funnels into the quantum critical point. Our study thereby provides an important proof-of-principle example that new physics can be detected via unbiased machine-learning approaches.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Driskell, George UNSPECIFIED UNSPECIFIED UNSPECIFIED Lederer, Samuel UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Trebst, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Eun-Ah UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-570184
DOI:	10.1103/PhysRevLett.127.046601
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	127
Number:	4
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SIGN-PROBLEM; RESISTIVITY; BEHAVIOR Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57018