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Critical Properties of Spectral Functions for the 1D Anisotropic t-J Models with an Energy Gap | | T. Fujii
; Y. Tsukamoto
; N. Kawakami
; | | Date: |
22 Oct 1997 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We exactly calculate the momentum-dependent critical exponents for spectral functions in the one-dimensional anisotropic t-J models with a gap either in the spin or charge excitation spectrum. Our approach is based on the Bethe ansatz technique combined with finite-size scaling techniques in conformal field theory. It is found that the spectral functions show a power-law singularity, which occurs at frequencies determined by the dispersion of a massive spin (or charge) excitation.We discuss how the nontrivial contribution of a massive excitation controls the singular behavior in optical response functions. | | Source: | arXiv, cond-mat/9710237 | | Services: | Forum | Review | PDF | Favorites | |
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