Spectroscopic signatures of a bandwidth-controlled Mott transition at the surface of 1T-TaSe2

High-resolution angle-resolved photoemission data show that a metal-insulator Mott transition occurs at the surface of the quasi-two-dimensional compound 1T-TaSe2. The transition is driven by the narrowing of the Ta 5d band induced by a temperature-dependent modulation of the atomic positions. A dyn...

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Published inPhysical review letters Vol. 90; no. 16; p. 166401
Main Authors Perfetti, L, Georges, A, Florens, S, Biermann, S, Mitrovic, S, Berger, H, Tomm, Y, Höchst, H, Grioni, M
Format Journal Article
LanguageEnglish
Published United States 25.04.2003
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Summary:High-resolution angle-resolved photoemission data show that a metal-insulator Mott transition occurs at the surface of the quasi-two-dimensional compound 1T-TaSe2. The transition is driven by the narrowing of the Ta 5d band induced by a temperature-dependent modulation of the atomic positions. A dynamical mean-field theory calculation of the spectral function of the half-filled Hubbard model captures the main qualitative feature of the data, namely, the rapid transfer of spectral weight from the observed quasiparticle peak at the Fermi surface to the Hubbard bands, as the correlation gap opens up.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.90.166401