Back to Search
Start Over
Dirac Cone with Helical Spin Polarization in Ultrathin α-Sn(001) Films.
- Source :
-
Physical Review Letters . 11/22/2013, Vol. 111 Issue 21, p216401-1-216401-5. 5p. - Publication Year :
- 2013
-
Abstract
- Spin-split two-dimensional electronic states have been observed on ultrathin Sn(001) films grown on InSb(001) substrates. Angle-resolved photoelectron spectroscopy (ARPES) performed on these films revealed Dirac-cone-like linear dispersion around the ̄Γ point of the surface Brillouin zone, suggesting nearly massless electrons belonging to 2D surface states. The states disperse across a band gap between bulklike quantum well states in the films. Moreover, both circular dichroism of ARPES and spin-resolved ARPES studies show helical spin polarization of the Dirac-cone-like surface states, suggesting a topologically protected character as in a bulk topological insulator (TI). These results indicate that a quasi-3D TI phase can be realized in ultrathin films of zero-gap semiconductors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 111
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 92969102
- Full Text :
- https://doi.org/10.1103/PhysRevLett.111.216401