Optical conductivity of the half-filled Hubbard chain

被引:96
|
作者
Jeckelmann, E [1 ]
Gebhard, E
Essler, FHL
机构
[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
关键词
D O I
10.1103/PhysRevLett.85.3910
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We combine well-controlled analytical and numerical methods to determine the optical conductivity of the one-dimensional Mott-Hubbard insulator at zero temperature. A dynamical density-matrix renormalization group method provides the entire absorption spectrum for all but very small coupling strengths. In this limit we calculate the conductivity analytically using exact field-theoretical methods. Above the Lieb-Wu gap the conductivity exhibits a characteristic square-root increase. For small to moderate interactions, a sharp maximum occurs just above the gap. For larger interactions, another weak feature becomes visible around the middle of the absorption band.
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页码:3910 / 3913
页数:4
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