Peculiar Rashba splitting originating from the two-dimensional symmetry of the surface.
A peculiar Rashba effect is found at a point in the Brillouin zone, where the time-reversal symmetry is broken, though this symmetry was believed to be a necessary condition for Rashba splitting. This finding obtained experimentally by photoemission measurements on a Bi/Si(111)-(sqrt(3) x sqrt(3)) surface is fully confirmed by a first-principles theoretical calculation. We found that the peculiar Rashba effect is simply understood by the two-dimensional symmetry of the surface, and that this effect leads to an unconventional nonvortical Rashba spin structure at a point with time-reversal invariance.
Sakamoto
Kazuyuki
K
Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan. kazuyuki_sakamoto@faculty.chiba-u.jp
Kakuta
Haruya
H
Sugawara
Katsuaki
K
Miyamoto
Koji
K
Kimura
Akio
A
Kuzumaki
Takuya
T
Ueno
Nobuo
N
Annese
Emilia
E
Fujii
Jun
J
Kodama
Ayaka
A
Shishidou
Tatsuya
T
Namatame
Hirofumi
H
Taniguchi
Masaki
M
Sato
Takafumi
T
Takahashi
Takashi
T
Oguchi
Tamio
T