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:
CreatorsEmailORCIDORCID Put Code
Driskell, GeorgeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lederer, SamuelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, CarstenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Trebst, SimonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, Eun-AhUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
SIGN-PROBLEM; RESISTIVITY; BEHAVIORMultiple languages
Physics, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/57018

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