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26 April 2024 |
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Article overview
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Two-Dimensional Holstein Model: Critical Temperature, Ising Universality, and Bipolaron Liquid | | Manuel Weber
; Martin Hohenadler
; | | Date: |
4 Sep 2017 | | Abstract: | Fundamental open questions about the two-dimensional Holstein model of
electrons coupled to quantum phonons are addressed by continuous-time quantum
Monte Carlo simulations. The critical temperature of the charge-density-wave
transition is determined by a finite-size scaling of a
renormalization-group-invariant correlation ratio. $T_c$ is finite for any
nonzero coupling for classical phonons, and suppressed by quantum lattice
fluctuations. The phase transition---also detectable via the fidelity
susceptibility and machine learning---is demonstrated to be in the universality
class of the two-dimensional quantum Ising model. We discuss the possibility of
$T_c=0$ at weak coupling and present evidence for a spin-gapped, bipolaronic
metal above $T_c$. | | Source: | arXiv, 1709.1096 | | Services: | Forum | Review | PDF | Favorites | |
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