期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.077601
关键词
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资金
- DFG [SFB 1170]
- Ministry of Science and Technology ofChina through theNationalKey Research and Development Program [2016YFA0300502]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB28000000]
- National Science Foundation of China [11574359]
- Hong Kong Research Grants Council (HKRGC) [C6026-16W, 16324216, 16307117]
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 electronphonon coupling.
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