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  • Letter
  • Open Access

Extended regime of metastable metallic and insulating phases in a two-orbital electronic system

M. Vandelli1,2,3, J. Kaufmann4, V. Harkov1,5, A. I. Lichtenstein1,5,2, K. Held4, and E. A. Stepanov6,*

  • 1I. Institute of Theoretical Physics, University of Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany
  • 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany
  • 3Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, D-22761 Hamburg, Germany
  • 4Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria
  • 5European X-Ray Free-Electron Laser Facility, Holzkoppel 4, D-22869 Schenefeld, Germany
  • 6CPHT, CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France

  • *evgeny.stepanov@polytechnique.edu
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Phys. Rev. Research 5, L022016 – Published 25 April, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022016

Abstract

We investigate the metal-to-insulator phase transition driven by the density-density electronic interaction in the quarter-filled model on a cubic lattice with two orbitals split by a crystal field. We show that a systematic consideration of the nonlocal collective electronic fluctuations strongly affects the picture of the phase transition provided by the dynamical mean-field theory. Our calculations reveal the appearance of metallic and Mott insulating states characterized by the same density but different values of the chemical potential, which is missing in the local approximation to electronic correlations. We find that the region of concomitant metastability of these two solutions is remarkably broad in terms of the interaction strength. It starts at a critical value of the interaction slightly larger than the bandwidth and extends to more than twice the bandwidth, where the two solutions merge into a Mott insulating phase. Our results illustrate that nonlocal correlations can have crucial consequences on the electronic properties in the strongly correlated regime of the simplest multiorbital systems.

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Outline

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Phys. Rev. Research 5, L022016– Published 25 April, 2023
  • Received 5 April 2022
  • Revised 16 February 2023
  • Accepted 17 February 2023
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