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Finite-frequency optical absorption in 1D conductors and Mott-Hubbard insulators

被引：27
作者：
Carmelo, JMP
Peres, NMR
Sacramento, PD
机构：
[1] Univ Calif Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA
[2] Univ Evora, Dept Phys, P-7002554 Evora, Portugal
[3] IST, Dept Fis, P-1049001 Lisbon, Portugal
[4] IST, CFIF, P-1049001 Lisbon, Portugal
来源：
PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 20期
关键词：
D O I：
10.1103/PhysRevLett.84.4673
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The frequency-dependent conductivity is studied for the one-dimensional Hubbard model, using a selection rule, the Bethe ansatz, and symmetries associated with conservation laws. For densities where the system is metallic the absorption spectrum has two contributions, a Drude peak at omega = 0 separated by a pseudogap from a broad absorption band whose lower edge is characterized by a nonclassical critical exponent. Our findings shed new light on the "far infrared puzzle" and other optical properties of metallic organic chain compounds.
引用
收藏
页码：4673 / 4676
页数：4
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