Work

Two-dimensional Holstein-Hubbard model: Critical temperature, Ising universality, and bipolaron liquid

Year: 2018

Type: article

Abstract: The two-dimensional Holstein-Hubbard model is studied by means of continuous-time quantum Monte Carlo simulations. Using renormalization-group-invariant correlation ratios and finite-size extrapolation, the critical temperature of the charge-density-wave transition is determined as a function of coupling strength, phonon frequency, and Hubbard repulsion. The phase transition is demonstrated to be in the universality class of the two-dimensional Ising model and detectable via the fidelity susceptibility. The structure of the ground-state phase diagram and the possibility of a bipolaronic metal with a single-particle gap above ${T}_{c}$ are explored.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.98.085405

Authors: Manuel Weber, Martin Hohenadler

Institution: University of Würzburg

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Deutsche Forschungsgemeinschaft

Awards: G1252056419, G2158694287