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Non-trivial surface-band dispersion on Bi(111)
- Source :
- New Journal of Physics. 15:033041
- Publication Year :
- 2013
- Publisher :
- IOP Publishing, 2013.
-
Abstract
- We performed angle-resolved photoelectron spectroscopy of the Bi(111) surface to demonstrate that this surface support edge states of non-trivial topology. Along the $\bar{\Gamma}\bar{M}$-direction of the surface Brillouin zone, a surface-state band disperses from the projected bulk valence bands at $\bar{\Gamma}$ to the conduction bands at $\bar{M}$ continuously, indicating the non-trivial topological order of three-dimensional Bi bands. We ascribe this finding to the absence of band inversion at the $L$ point of the bulk Bi Brillouin zone. According to our analysis, a modification of tight-binding parameters can account for the non-trivial band structure of Bi without any other significant change on other physical properties.<br />Comment: 13 pages, 4 figures. This manuscript has been accepted in New Journal of Physics
- Subjects :
- Brillouin zone
Condensed Matter - Materials Science
Valence (chemistry)
Materials science
X-ray photoelectron spectroscopy
Condensed matter physics
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
General Physics and Astronomy
Topological order
Edge states
Electronic band structure
Conduction band
Subjects
Details
- ISSN :
- 13672630
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- New Journal of Physics
- Accession number :
- edsair.doi.dedup.....189e16dd1996691b5255156e92c5954c