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| Home > NIC > Charge-Density-Wave Transitions of Dirac Fermions Coupled to Phonons |
| Journal Article | FZJ-2020-03850 |
; ; ;
2019
APS
College Park, Md.
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Please use a persistent id in citations: doi:10.1103/PhysRevLett.122.077601
Abstract: The spontaneous generation of charge-density-wave order in a Dirac fermion system via the natural mechanism of electron-phonon coupling is studied in the framework of the Holstein model on the honeycomb lattice. Using two independent and unbiased quantum Monte Carlo methods, the phase diagram as a function of temperature and coupling strength is determined. It features a quantum critical point as well as a line of thermal critical points. Finite-size scaling appears consistent with fermionic Gross-Neveu-Ising universality for the quantum phase transition and bosonic Ising universality for the thermal phase transition. The critical temperature has a maximum at intermediate couplings. Our findings motivate experimental efforts to identify or engineer Dirac systems with sufficiently strong and tunable electron-phonon coupling.
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