Mott transition and pseudogap of the square-lattice Hubbard model: Results from center-focused cellular dynamical mean-field theory

Meixner M, Menke H, Klett M, Heinzelmann S, Andergassen S, Hansmann P, Schäfer T (2024)

Publication Type: Journal article

Publication year: 2024

Journal

SciPost Physics SciPost

Book Volume: 16

Article Number: 059

Journal Issue: 2

DOI: 10.21468/SciPostPhys.16.2.059

Abstract

The recently proposed center-focused post-processing procedure [Phys. Rev. Res. 2, 033476 (2020)] of cellular dynamical mean-field theory suggests that central sites of large impurity clusters are closer to the exact solution of the Hubbard model than the edge sites. In this paper, we systematically investigate results in the spirit of this center-focused scheme for several cluster sizes up to 8 × 8 in and out of particle-hole symmetry. First we analyze the metal-insulator crossovers and transitions of the half-filled Hubbard model on a simple square lattice. We find that the critical interaction of the crossover is reduced with increasing cluster sizes and the critical temperature abruptly drops for the 4 × 4 cluster. Second, for this cluster size, we apply the center-focused scheme to a system with more realistic tight-binding parameters, investigating its pseudogap regime as a function of temperature and doping, where we find doping dependent metal-insulator crossovers, Lifshitz transitions and a strongly renormalized Fermi-liquid regime. Additionally to diagnosing the real space origin of the suppressed antinodal spectral weight in the pseudogap regime, we can infer hints towards underlying charge ordering tendencies.

Authors with CRIS profile

Philipp Hansmann Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien

Involved external institutions

Technische Universität Wien / Vienna University of Technology AT Austria (AT) Max-Planck-Institut für Festkörperforschung DE Germany (DE) Eberhard Karls Universität Tübingen DE Germany (DE)

How to cite

APA:

Meixner, M., Menke, H., Klett, M., Heinzelmann, S., Andergassen, S., Hansmann, P., & Schäfer, T. (2024). Mott transition and pseudogap of the square-lattice Hubbard model: Results from center-focused cellular dynamical mean-field theory. SciPost Physics, 16(2). https://doi.org/10.21468/SciPostPhys.16.2.059

MLA:

Meixner, Michael, et al. "Mott transition and pseudogap of the square-lattice Hubbard model: Results from center-focused cellular dynamical mean-field theory." SciPost Physics 16.2 (2024).

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