Resonant inelastic X-ray scattering of the holon-antiholon continuum in SrCuO2 -: art. no. 137402

被引：69
作者：
Kim, YJ [1 ]
Hill, JP
Benthien, H
Essler, FHL
Jeckelmann, E
Choi, HS
Noh, TW
Motoyama, N
Kojima, KM
Uchida, S
Casa, D
Gog, T
机构：
[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[2] Univ Marburg, Dept Phys, D-35032 Marburg, Germany
[3] Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[4] Seoul Natl Univ, ReCOE, Seoul 151747, South Korea
[5] Seoul Natl Univ, Sch Phys, Seoul 151747, South Korea
[6] Univ Tokyo, Grad Sch Frontier Sci, Bunkyo Ku, Tokyo 1138656, Japan
[7] Argonne Natl Lab, CMC, CAT, Adv Photon Source, Argonne, IL 60439 USA
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 13期
关键词：
D O I：
10.1103/PhysRevLett.92.137402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 similar to0.4 eV. Within this continuum, a highly dispersive feature with a large sinusoidal dispersion (similar to1.1 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.
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页码：137402 / 1
页数：4
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