Spin Dynamics in the Supersymmetric t–J Model with Inverse-Square Interaction

抄録

The dynamical spin structure factor S(q,ω) is obtained analytically for the one-dimensional supersymmetric t–J model with 1⁄r² interaction. In contrast with the conventional view on the spin–charge separation, interpretation of S(q,ω) requires both fractionalized and non-fractionalized electrons depending on the energy–momentum region. At low energies, the spectrum is naturally explained in terms of spinons, holons, and antiholons, all of which obey fractional exclusion statistics.