Normal state properties of quantum-critical metals at finite temperatures

ORAL

Abstract

Recent years have seen an intense effort to study models of fermionic quantum criticality and superconductivity via sign-problem-free quantum Monte Carlo. These studies found a number of puzzling features, which are in qualitative disagreement with quantum-critical-scaling theories and, in particular, cast doubt on the validity of Eliashberg-type approaches to quantum criticality. I will discuss how thermal fluctuations destroy the nice scaling properties of quantum-critical systems and show that after generalizing Eliashberg theory to account for thermal fluctuations many of the qualitative disagreements vanish. This work provides concrete guidelines for analyzing ongoing numerical work.

*This work was supported by BSF grant 2018217 (A.K, E.B. and A.V.C), and by the NSF DMR-1523036 (A.V.C.). E.B. was supported by the ERC under grant HQMAT.

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Presenters

  • Avraham Klein

    • University of Minnesota

Authors

  • Avraham Klein

    • University of Minnesota

  • Yoni Schattner

    • Stanford Univ
    • Department of Physics, Stanford University
    • Stanford University

  • Erez Berg

    • Weizmann Institute of Science
    • Department of Physics, Weizmann Intitute of Science

  • Andrey Chubukov

    • University of Minnesota
    • Physics, University of Minnesota