Manifestation of Spin-Charge Separation in the Dynamic Dielectric Response of One-DimensionalSr2CuO3

1998/06/22 by R. Neudert, M. Knupfer, M. S. Golden +8 · 5 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.81.657

published as Phys. Rev. Lett. 81, 657 (1998) · RevTex, 4 pages+2 figures, to appear in PRL (July 13)

arxiv created 1998/06/22 · openalex publication_date 1998/07/20 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

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.

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