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Excitation spectrum and critical exponents of a one-dimensional integrable model of fermions with correlated hopping | | R.Z. Bariev
; A. Klümper
; A. Schadschneider
; J. Zittartz
; | | Date: |
8 Jun 1993 | | Subject: | cond-mat | | Abstract: | We investigate the excitation spectrum of a model of $N$ colour fermions with correlated hopping which can be solved by a nested Bethe ansatz. The gapless excitations of particle-hole type are calculated as well as the spin-wave like excitations which have a gap. Using general predictions of conformal field theory the long distance behaviour of some groundstate correlation functions are derived from a finite-size analysis of the gapless excitations. From the algebraic decay we show that for increasing particle density the correlation of so-called $N$-multiplets of particles dominates over the density-density correlation. This indicates the presence of bound complexes of these $N$-multiplets. This picture is also supported by the calculation of the effective mass of charge carriers. | | Source: | arXiv, cond-mat/9306018 | | Services: | Forum | Review | PDF | Favorites | |
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