Photoemission of a doped Mott insulator: spectral weight transfer and qualitative Mott-Hubbard description

Details Photoemission of a doped Mott insulator: spectral weight transfer and qualitative Mott-Hubbard description Photoemission of a doped Mott insulator: spectral weight transfer and qualitative Mott-Hubbard description

2009-05-09

arxiv.org/abs/0905.1381v3

Phys. Rev. Lett. 106, 056403 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, related theoretical work can be found in arXiv:0905.1276; shortened

Scientific paper

The spectral weight evolution of the low-dimensional Mott insulator TiOCl upon alkali-metal dosing has been studied by photoelectron spectroscopy. We observe a spectral weight transfer between the lower Hubbard band and an additional peak upon electron-doping, in line with quantitative expectations in the atomic limit for changing the number of singly and doubly occupied sites. This observation is an unconditional hallmark of correlated bands and has not been reported before. In contrast, the absence of a metallic quasiparticle peak can be traced back to a simple one-particle effect.

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