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