Phys. Rev. Lett. 81, 657–660 (1998)Manifestation of Spin-Charge Separation in the Dynamic Dielectric Response of One-Dimensional Sr2CuO3Received 2 April 1998; published in the issue dated 20 July 1998 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 excitonlike 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. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.657
DOI:
10.1103/PhysRevLett.81.657
PACS:
71.27.+a, 71.10.Fd, 71.45.Gm
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