TY  - JOUR
AU  - Chen, Chuang
AU  - Xu, Xiao Yan
AU  - Meng, Zi Yang
AU  - Hohenadler, Martin
TI  - Charge-Density-Wave Transitions of Dirac Fermions Coupled to Phonons
JO  - Physical review letters
VL  - 122
IS  - 7
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2020-03850
SP  - 077601
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/PhysRevLett.122.077601
UR  - https://juser.fz-juelich.de/record/885467
ER  -