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Spontaneous ferromagnetism and finite surface energy gap in the topological insulator Bi$_2$Se$_3$ from surface Bi$_\rm{{Se}}$ antisite defects
- Source :
- Phys. Rev. B 102, 140407 (2020)
- Publication Year :
- 2020
-
Abstract
- We perform ab-initio calculations on Bi$_\mathrm{{Se}}$ antisite defects in the surface of Bi$_2$Se$_3$, finding strong low-energy defect resonances with a spontaneous ferromagnetism, fixed to an out-of-plane orientation due to an exceptional large magnetic anisotropy energy. For antisite defects in the surface layer, we find semi-itinerant ferromagnetism and strong hybridization with the Dirac surface state, generating a finite energy gap. For deeper lying defects, such hybridization is largely absent, the magnetic moments becomes more localized, and no energy gap is present.<br />Comment: 13 pages, 9 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 102, 140407 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2002.03962
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.102.140407