Topological states on the gold surface
2015 | journal article. A publication with affiliation to the University of Göttingen.
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- Authors
- Yan, Binghai; Stadtmueller, Benjamin; Haag, Norman; Jakobs, Sebastian; Seidel, Johannes; Jungkenn, Dominik; Mathias, Stefan ; Cinchetti, Mirko; Aeschlimann, Martin; Felser, Claudia
- Abstract
- Gold surfaces host special electronic states that have been understood as a prototype of Shockley surface states. These surface states are commonly employed to benchmark the capability of angle-resolved photoemission spectroscopy (ARPES) and scanning tunnelling spectroscopy. Here we show that these Shockley surface states can be reinterpreted as topologically derived surface states (TDSSs) of a topological insulator (TI), a recently discovered quantum state. Based on band structure calculations, the Z(2)-type invariants of gold can be well-defined to characterize a TI. Further, our ARPES measurement validates TDSSs by detecting the dispersion of unoccupied surface states. The same TDSSs are also recognized on surfaces of other well-known noble metals (for example, silver, copper, platinum and palladium), which shines a new light on these long-known surface states.
- Issue Date
- 2015
- Status
- published
- Publisher
- Nature Publishing Group
- Journal
- Nature Communications
- Organization
- Fakultät für Physik
- ISSN
- 2041-1723
- Sponsor
- ERC Advanced Grant [291472]