Dynamical Properties of the One-Dimensional Band Insulator(NbSe4)3I
| Autor: | V. Vescoli, F. Zwick, J. Voit, Helmuth Berger, George Grüner, Leonardo Degiorgi, Michele Zacchigna, Marco Grioni |
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| Rok vydání: | 2000 |
| Předmět: |
Physics
Valence (chemistry) Condensed matter physics Band gap Inverse photoemission spectroscopy General Physics and Astronomy Angle-resolved photoemission spectroscopy Optical conductivity Semimetal Spectral line Condensed Matter::Materials Science Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Direct and indirect band gaps |
| Zdroj: | Physical Review Letters. 84:1272-1275 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.84.1272 |
| Popis: | Optical and photoemission experiments reveal unexpected spectral signatures of one-dimensional band insulators. In the model compound (NbSe4)(3)I the optical conductivity decays as a power law sigma(1)(omega) similar to omega(-4.25) above a sharp gap edge. Photoemission observes both the valence and a shadow band, produced w by a commensurate superstructure. We identify an optical and photoemission band gap consistent with other measurements but much smaller than the energy scale defined by the dispersion of the band peak in the photoemission spectra. |
| Databáze: | OpenAIRE |
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