Topological states on the gold surface

Binghai Yan (), Benjamin Stadtmüller, Norman Haag, Sebastian Jakobs, Johannes Seidel, Dominik Jungkenn, Stefan Mathias, Mirko Cinchetti, Martin Aeschlimann and Claudia Felser
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Binghai Yan: Max Planck Institute for Chemical Physics of Solids
Benjamin Stadtmüller: University of Kaiserslautern
Norman Haag: University of Kaiserslautern
Sebastian Jakobs: University of Kaiserslautern
Johannes Seidel: University of Kaiserslautern
Dominik Jungkenn: University of Kaiserslautern
Stefan Mathias: I. Physikalisches Institut, Georg-August-Universität Göttingen
Mirko Cinchetti: University of Kaiserslautern
Martin Aeschlimann: University of Kaiserslautern
Claudia Felser: Max Planck Institute for Chemical Physics of Solids

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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 Z2-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.

Date: 2015
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DOI: 10.1038/ncomms10167

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