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Inducing a Lifshitz transition by extrinsic doping of surface bands in the topological crystalline insulator Pb1-xSnxSe.
- Source :
-
Physical review letters [Phys Rev Lett] 2014 Apr 11; Vol. 112 (14), pp. 146403. Date of Electronic Publication: 2014 Apr 10. - Publication Year :
- 2014
-
Abstract
- The narrow gap semiconductor Pb1-xSnxSe was investigated for topologically protected surface states in its rocksalt structural phase for x=0.45, 0.23, 0.15, and 0. Angle-resolved photoelectron spectroscopy of intrinsically p-doped samples showed a clear indication of two Dirac cones, eccentric about the time-reversal invariant point X¯ of the surface Brillouin zone for all but the x=0 sample. Adsorption of alkalies gradually filled the surface bands with electrons, driving the x>0 topological crystalline insulator systems through Lifshitz transitions, and from a holelike to electronlike Fermi surface. The electron-doped bands in x>0 samples exhibited the full configuration of the Dirac cones, also confirming electron-hole symmetry of the surface bands.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 112
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 24765995
- Full Text :
- https://doi.org/10.1103/PhysRevLett.112.146403