Manifestation of spin-charge separation in the dynamic dielectric response of one--dimensional Sr2CuO3

Details Manifestation of spin-charge separation in the dynamic dielectric response of one--dimensional Sr2CuO3 Manifestation of spin-charge separation in the dynamic dielectric response of one--dimensional Sr2CuO3

1998-06-22

arxiv.org/abs/cond-mat/9806257v1

Phys. Rev. Lett. 81, 657 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, 4 pages+2 figures, to appear in PRL (July 13)

Scientific paper

10.1103/PhysRevLett.81.657

We have determined the dynamical dielectric response of a one-dimensional, correlated insulator by carrying out electron energy-loss spectroscopy on Sr2CuO3 single crystals. The observed momentum and energy dependence of the low-energy features, which correspond to collective transitions across the gap, are well described by an extended one-band Hubbard model with moderate nearest neighbor Coulomb interaction strength. An exciton-like peak appears with increasing momentum transfer. These observations provide experimental evidence for spin-charge separation in the relevant excitations of this compound, as theoretically expected for the one-dimensional Hubbard model.

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