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

Abstract

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.

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

References in corpus (4)

• Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model
• Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl
• One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr
• Can the Mott Insulator TiOCl be Metallized by Doping? A First-Principles Study

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• Unoccupied electronic structure of TiOCl studied by x-ray absorption near-edge spectroscopy
• Pressure-driven phase transitions in correlated systems
• Hubbard Physics in the PAW GW Approximation