期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 18, 页码 3910-3913出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3910
关键词
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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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