Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.236402
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Funding
- Basic Science Center Project of NSFC [51788104]
- Ministry of Science and Technology of China [2016YFA0301001]
- National Natural Science Foundation of China [11674071, 11674188]
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201702]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- U.S. DOE [DE-SC0002623]
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First-principles calculations reveal an unusual electronic state (dubbed as half excitonic insulator) in monolayer 1T-MX2(M = Co, Ni and X = Cl, Br). Its one spin channel has a many-body ground state due to excitonic instability, while the other is characterized by a conventional band insulator gap. This disparity arises from a competition between the band gap and exciton binding energy, which exhibits a spin dependence due to different orbital occupations. Such a state can be identified by optical absorption measurements and angle-resolved photoemission spectroscopy. Our theory not only provides new insights for the study of exciton condensation in magnetic materials but also suggests that strongly correlated materials could be fertile candidates for excitonic insulators.
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