Transfer of Spectral Weight and Symmetry across the Metal-Insulator Transition 
in VO2

Koethe, T. C.; Hu, Z.; Haverkort, M. W.; Schüßler-Langeheine, C.; Venturini, F.; Brookes, N. B.; Tjernberg, O.; Reichelt, W.; Hsieh, H. H.; Lin, H. -J.; Chen, C. T.; Tjeng, L. H.

doi:10.1103/PhysRevLett.97.116402

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Transfer of Spectral Weight and Symmetry across the Metal-Insulator Transition in VO₂

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Koethe, T. C., Hu, Z., Haverkort, M. W., Schüßler-Langeheine, C., Venturini, F., Brookes, N. B., Tjernberg, O., Reichelt, W., Hsieh, H. H., Lin, H.-.-J., Chen, C. T., & Tjeng, L. H. (2006). Transfer of Spectral Weight and Symmetry across the Metal-Insulator Transition in VO₂. Physical Review Letters, 97(11):, pp. 1-4. doi:10.1103/PhysRevLett.97.116402.

引用: https://hdl.handle.net/11858/00-001M-0000-0019-1812-C

要旨

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.