Probing quasiparticle states bound by disparate periodic potentials.
Thin films of Ag(111) with two-dimensional crystallinity of large lateral coherence grow on Ge(111), free of in-plane registry with the underlying substrate. Ag s-p electrons forming two-dimensional quantum well states scatter coherently at the buried interface potential, resulting in an unexpected set of new quasiparticle states, as observed by angle-resolved photoemission. These new features originate from interactions among Ag quantum well bands, gaining a momentum equivalent to a reciprocal vector of the substrate lattice.
Moras
P
P
Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy.
Ferrari
L
L
Spezzani
C
C
Gardonio
S
S
Lezaić
M
M
Mavropoulos
Ph
P
Blügel
S
S
Carbone
C
C