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Spin-Triplet Excitonic Insulator: The Case of Graphone
- Source :
- Phys. Rev. Lett. 124, 166401 (2020)
- Publication Year :
- 2019
-
Abstract
- 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 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 graphone, which offers yet another test by experiment.<br />Comment: Accepted by PRL
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 124, 166401 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1911.05244
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.124.166401