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2015 ; 6
(ä): 10167
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Topological states on the gold surface
#MMPMID26658826
Yan B
; Stadtmüller B
; Haag N
; Jakobs S
; Seidel J
; Jungkenn D
; Mathias S
; Cinchetti M
; Aeschlimann M
; Felser C
Nat Commun
2015[Dec]; 6
(ä): 10167
PMID26658826
show ga
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.