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Transfer of spectral weight and symmetry across the metal-insulator transition in VO(2)

Transfer of spectral weight and symmetry across the metal-insulator transition in VO(2)

Authors :
Christian Schüßler-Langeheine
H. H. Hsieh
F. Venturini
Liu Hao Tjeng
W. Reichelt
C. T. Chen
T. C. Koethe
N. B. Brookes
Hong-Ji Lin
Maurits W. Haverkort
Zhiwei Hu
Oscar Tjernberg
Source :
Physical review letters. 97(11)
Publication Year :
2006

Abstract

We present a detailed study of the valence and conduction bands of VO2 across the metal-insulator transition using bulk-sensitive photoelectron and O K x-ray absorption spectroscopies. We observe a giant transfer of spectral weight with distinct features that require an explanation which goes beyond the Peierls transition model as well as the standard single-band Hubbard model. Analysis of the symmetry and energies of the bands reveals the decisive role of the V 3d orbital degrees of freedom. Comparison to recent realistic many body calculations shows that much of the k dependence of the self-energy correction can be cast within a dimer model.

Details

ISSN :
00319007
Volume :
97
Issue :
11
Database :
OpenAIRE
Journal :
Physical review letters
Accession number :
edsair.doi.dedup.....daba192713506a694e6edefe43a317fa