Transfer of spectral weight and symmetry across the metal-insulator transition in VO2
2006 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 97, no 11Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 97, no 11
x-ray photoelectron, electronic-structure, phase-transitions, mott-hubbard, band theory, photoemission, oxides, v2o3, temperature, absorption
IdentifiersURN: urn:nbn:se:kth:diva-15992DOI: 10.1103/PhysRevLett.97.116402ISI: 000240545600048ScopusID: 2-s2.0-33748681104OAI: oai:DiVA.org:kth-15992DiVA: diva2:334034
QC 201005252010-08-052010-08-05Bibliographically approved