Fractional band filling in an atomic chain structure.
A new chain structure of Au is found on stepped Si(111) which exhibits a 1/4-filled band and a pair of > or =1/2-filled bands with a combined filling of 4/3. Band dispersions and Fermi surfaces for Si(553)-Au are obtained by photoemission and compared to that of Si(557)-Au. The dimensionality of both systems is determined using a tight binding fit. The fractional band filling makes it possible to preserve metallicity in the presence of strong correlations.
Crain
J N
JN
Department of Physics, UW-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.
Kirakosian
A
A
Altmann
K N
KN
Bromberger
C
C
Erwin
S C
SC
McChesney
J L
JL
Lin
J-L
JL
Himpsel
F J
FJ