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Half Excitonic Insulator: A Single-Spin Bose-Einstein Condensate
- Source :
- Phys. Rev. Lett. 122, 236402 (2019)
- Publication Year :
- 2018
-
Abstract
- 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.<br />Comment: Accepted by PRL
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 122, 236402 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1811.03738
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.122.236402