Phys. Rev. Lett. 84, 1272–1275 (2000)Dynamical Properties of the One-Dimensional Band Insulator (NbSe4)3IReceived 15 July 1999; published in the issue dated 7 February 2000 Optical and photoemission experiments reveal unexpected spectral signatures of one-dimensional band insulators. In the model compound (NbSe4)3I the optical conductivity decays as a power law σ1(ω)∼ω-4.25 above a sharp gap edge. Photoemission observes both the valence and a shadow band, produced 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.1272
DOI:
10.1103/PhysRevLett.84.1272
PACS:
71.10.Pm, 71.20.Ps, 78.30.Hv, 79.60.-i
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