Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-07-15
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages. A hard copy of 13 figures is available on request. Submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.68.3631
Dynamical properties, such as dynamical spin and charge structure factors and single-particle spectral functions, are studied for the one-dimensional supersymmetric t-J model with inverse-square interaction. Exact diagonalization and the recursion method are used for finite systems up to 16 sites. A simple rule is proposed to understand the supermultiplet structure in the excitation spectrum. Numerical calculations show that the dynamical spin structure factor is independent of the electron density in the region where only two spinons contribute. In the electron removal spectrum from half-filling, close correspondence is found between the dominant contribution from three-spinon plus one-holon states in the t-J model and the two-spinon excitations in the Haldane-Shastry model. Comparison is made with dynamics of the nearest-neighbor supersymmetric t-J model.
Kuramoto Yoshio
Saiga Yasuhiro
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