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Dispersion relation of charge gap excitations in quasi-1D Mott insulators studied by resonant X-ray scattering


D. Qian, Y.W. Li, M.Z. Hasan, D.M. Casa, T. Gog, Y.D. Chuang, K. Tsutsui, T. Tohyama, S. Maekawa, H. Eisaki, S. Uchida

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
66 (12): 2212-2215 (Dec 2005)

Abstract:
Momentum dependence of charge excitations across the effective Mott gap in several quasi-low-dimensional model cuprates with different effective dimensionalities is studied using high resolution inelastic X-ray scattering by working near Copper k-edge resonance which allows us to extract the dispersion relations of the particle-hole pair excitations at the gap edge. Besides electron-electron correlation, momentum dependence of the gap-excitations is found to be strongly dependent on the effective dimensionality (or topology) of the 3d(x2-y2) network. (c) 2005 Published by Elsevier Ltd.

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