Dynamical properties of the one-dimensional band insulator (NbSe4)3I

被引：28

作者：

Vescoli, V ^{[1
]}

Zwick, F

Voit, J

Berger, H

Zacchigna, M

Degiorgi, L

Grioni, M

Grüner, G

机构：

[1] ETH Zurich, Festkorperphys Lab, CH-8093 Zurich, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Phys Appl, CH-1015 Lausanne, Switzerland

[3] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

[4] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.84.1272

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：1272 / 1275

页数：4

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