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Tunable spin helical Dirac quasiparticles on the surface of three-dimensional HgTe
- Source :
- Physical Review B. 92
- Publication Year :
- 2015
- Publisher :
- American Physical Society (APS), 2015.
-
Abstract
- We show with systematic photoemission spectroscopy and scanning tunneling spectroscopy data that a spin helical surface state appears on the (110) surface of noncentrosymmetric, three-dimensional HgTe. The topological surface state in HgTe exhibits sharp, linear dispersion without ${k}_{z}$ variation, as well as clear, left-right imbalanced spin polarization and circular dichroism. Chemical gating by alkali metal deposition on the surface causes the unexpected opening and/or increase of a surface insulating gap without changing its topological property. Such an unusual behavior we uncover in three-dimensional HgTe sheds light on a convenient control of the Fermi surface and quantum transport in a topological insulator.
- Subjects :
- Condensed Matter::Quantum Gases
Physics
Condensed matter physics
Helical Dirac fermion
Spin polarization
Photoemission spectroscopy
Scanning tunneling spectroscopy
Fermi surface
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Topological insulator
Quasiparticle
Condensed Matter::Strongly Correlated Electrons
Spin-½
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 92
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........a17e0928f0daeecbbebd1642ea1f0e07