Metal-insulator transition in Au atomic chains on Si with two proximal bands.
Phys Rev Lett
; 91(19): 196403, 2003 Nov 07.
Article
em En
| MEDLINE
| ID: mdl-14611595
ABSTRACT
One-dimensional atomic chains on Au/Si(557) feature two proximal 1D bands near the Fermi level, which were controversially attributed as a spinon-holon pair of a Luttinger liquid. Angle-resolved photoemission shows that only one band is metallic with the neighboring one gapped at room temperature. Furthermore, even the metallic branch is found to undergo a metal-insulator transition upon cooling, which follows a mean-field-type behavior. Scanning tunneling microscopy observes two apparently unequivocal chains on the surface, one of which exhibits periodicity doubling accompanying the metal-insulator transition. The surface 1D structure is thus concluded to be insulating at low temperature with a Peierls-type instability.
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MEDLINE
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En
Ano de publicação:
2003
Tipo de documento:
Article