Quantum critical local spin dynamics near the Mott metal-insulator transition in infinite dimensions

Nagamalleswararao Dasari, N. S. Vidhyadhiraja, Mark Jarrell, and Ross H. McKenzie
Phys. Rev. B 95, 165105 – Published 5 April 2017

Abstract

Finding microscopic models for metallic states that exhibit quantum critical properties is a major theoretical challenge. We calculate the dynamical local spin susceptibility χ(T,ω) for a Hubbard model at half-filling using dynamical mean-field theory, which is exact in infinite dimensions. Qualitatively distinct behavior is found in the different regions of the phase diagram: Mott insulator, Fermi liquid metal, bad metal, and a quantum critical region above the finite-temperature critical point. The signature of the latter is ω/T scaling, where ω is the frequency and T is the temperature. Our results are consistent with previous results showing scaling of the dc electrical conductivity, and they are relevant to experiments on organic charge-transfer salts.

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  • Received 9 November 2016

DOI:https://doi.org/10.1103/PhysRevB.95.165105

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Nagamalleswararao Dasari1,*, N. S. Vidhyadhiraja1, Mark Jarrell2,3, and Ross H. McKenzie4,†

  • 1Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
  • 2Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 3Center for Computation & Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 4School of Mathematics and Physics, University of Queensland, Brisbane 4072, Australia

  • *nagamalleswararao.d@gmail.com
  • r.mckenzie@uq.edu.au; condensedconcepts.blogspot.com

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Issue

Vol. 95, Iss. 16 — 15 April 2017

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