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

被引：46
|
作者：
Weber, Manuel [1 ]
Hohenadler, Martin [1 ]
机构：
[1] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
来源：
PHYSICAL REVIEW B | 2018年 / 98卷 / 08期
关键词：
CHARGE-DENSITY-WAVE; MOLECULAR-CRYSTAL MODEL; ELECTRON-PHONON MODEL; PHASE-TRANSITIONS; GAP FORMATION; SPIN GAP; SUPERCONDUCTIVITY; SYSTEMS; ANTIFERROMAGNETISM; COMPETITION;
D O I：
10.1103/PhysRevB.98.085405
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：8
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