Physics – Condensed Matter
Scientific paper
1993-06-08
Physics
Condensed Matter
15 pages, 3 PostScript figures appended
Scientific paper
10.1088/0305-4470/26/19/019
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.
Bariev R. Z.
Klümper Andreas
Schadschneider Andreas
Zittartz Johannes
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