Finite-temperature charge dynamics and the melting of the Mott insulator

Xing-Jie Han, Chuang Chen, Jing Chen, Hai-Dong Xie, Rui-Zhen Huang, Hai-Jun Liao, B. Normand, Zi Yang Meng, and Tao Xiang
Phys. Rev. B 99, 245150 – Published 26 June 2019

Abstract

The Mott insulator is the quintessential strongly correlated electronic state. We obtain complete insight into the physics of the two-dimensional Mott insulator by extending the slave-fermion (holon-doublon) description to finite temperatures. We first benchmark its predictions against state-of-the-art quantum Monte Carlo simulations, demonstrating quantitative agreement. Qualitatively, the short-ranged spin fluctuations both induce holon-doublon bound states and renormalize the charge sector to form the Hubbard bands. The Mott gap is understood as the charge gap renormalized downward by these spin fluctuations. As temperature increases, the Mott gap closes before the charge gap, causing a pseudogap regime to appear naturally during the melting of the Mott insulator.

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  • Received 15 December 2018

DOI:https://doi.org/10.1103/PhysRevB.99.245150

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xing-Jie Han1,2,*, Chuang Chen1,3,*, Jing Chen1, Hai-Dong Xie1, Rui-Zhen Huang1, Hai-Jun Liao1, B. Normand4, Zi Yang Meng1,5, and Tao Xiang1,6

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Institut für Theoretische Festkörperphysik, RWTH Aachen University, 52056 Aachen, Germany
  • 3School of Physical Sciences, University of the Chinese Academy of Sciences, Beijing 100190, China
  • 4Neutrons and Muons Research Division, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 5CAS Center of Excellence in Topological Quantum Computation and School of Physical Sciences, University of the Chinese Academy of Sciences, Beijing 100190, China
  • 6Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

  • *These authors contributed equally to this paper.

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Issue

Vol. 99, Iss. 24 — 15 June 2019

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