Signatures of spin-charge separation in the 1D organic conductor TTF-TCNQ from photoelectron spectroscopy

R. Claessen*, M. Sing, Udo Schwingenschloegl, J. M.P. Carmelo

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

We have studied the electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ by angle-resolved photoelectron spectroscopy (ARPES). The data reveal significant discrepancies to conventional band theory. Instead the experimental dispersions can be quantitatively reproduced by the one-dimensional (1D) Hubbard model, if one allows for a surface-enhancement of the hopping integral induced by a relaxation of the tomost molecular layer. The TCNQ-related conduction band is thus found to display spectroscopic signatures of spin-charge separation on the energy scale of the band width. In contrast, the TTF-derived band seems to be only weakly correlated, at variance with other findings. The important role of electronic correlations in this material is further corrborated by a peculiar temperature dependence of the spectra. While the 1D Hubbard model thus yields a good description at finite excitation energies, it fails concerning the low-energy spectral behavior, most likely due to the additional importance of strong electron-phonon interaction and interchain electronic hopping on small energy scales.

Original languageEnglish (US)
Pages (from-to)51-55
Number of pages5
JournalJournal De Physique. IV : JP
Volume114
DOIs
StatePublished - Dec 1 2004
EventISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France
Duration: Sep 21 2003Sep 26 2003

Keywords

  • One-dimensional metals
  • Photoemission
  • Spin-charge separation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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