期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.166401
关键词
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资金
- Basic Science Center Project of NSFC [51788104]
- Ministry of Science and Technology of China [2016YFA0301001, 2018YFA0306101]
- National Natural Science Foundation of China [11674071, 11674188, 11434010, 11974340, 11574303, 61674145]
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201702]
- Science Challenge Project [TZ2018002]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- U.S. DOE [DE-SC0002623]
While various excitonic insulators have been studied in the literature, due to the perceived too-small spin splitting, spin-triplet excitonic insulator is rare. In two-dimensional systems such as a semihydrogenated graphene (known as graphone), however, it is possible, as revealed by first-principles calculations coupled with Bethe-Salpeter equation. The critical temperature, given by an effective Hamiltonian, is 11.5 K. While detecting excitonic insulators is still a daunting challenge, the condensation of triplet excitons will result in spin superfluidity, which can be directly measured by a transport experiment. Nonlocal dielectric screening also leads to an unexpected phenomenon, namely, an indirect-to-direct transition crossover between single-particle band and exciton dispersion in the semihydrogenated graphene, which offers yet another test by experiment.
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