Resonant inelastic X-ray scattering of the holon-antiholon continuum in SrCuO2.
We report a resonant inelastic x-ray scattering study of charge excitations in the quasi-one-dimensional Mott insulator SrCuO2. We observe a continuum of low-energy excitations, the onset of which exhibits a small dispersion of approximately 0.4 eV. Within this continuum, a highly dispersive feature with a large sinusoidal dispersion (approximately 1.1 eV) is observed. We have also measured the optical conductivity, and studied the dynamic response of the extended Hubbard model with realistic parameters, using a dynamical density-matrix renormalization group method. In contrast to earlier work, we do not find a long-lived exciton, but rather these results suggest that the excitation spectrum comprises a holon-antiholon continuum together with a broad resonance.
Kim
Young-June
YJ
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.
Hill
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JP
Benthien
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H
Essler
F H L
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Jeckelmann
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Choi
H S
HS
Noh
T W
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Motoyama
N
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Kojima
K M
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Uchida
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Casa
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D
Gog
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