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

• Verfasst von: Koethe, Thomas Christoph [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Transfer of spectral weight and symmetry across the metal-insulator transition in VO 2
• Verf.angabe: T.C. Koethe, Z. Hu, M.W. Haverkort, C. Schüßler-Langeheine, F. Venturini, N.B. Brookes, O. Tjernberg, W. Reichelt, H.H. Hsieh, H.-J. Lin, C.T. Chen, and L.H. Tjeng
• Fussnoten: Im Titel ist "2" tiefgestellt ; Gesehen am 08.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2006
• Band/Heft Quelle: 97(2006,11) Artikel-Nummer 116402, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.97.116402
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565129970

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.