CHARGE-SPIN RECOMBINATION IN THE ONE-DIMENSIONAL SUPERSYMMETRIC T-J MODEL

The dynamical properties of the one-dimensional supersymmetric t-J model in a magnetic field at T = 0 are investigated within the framework of the one-dimensional Landau-liquid theory. The effect of the magnetic field on the low-energy excitation spectrum is analyzed. The transport properties of the t-J model are studied in the low-frequency long-wavelength regime. The effective charge and spin of the elementary carriers are evaluated from the spectral currents. A microscopic criterion for the separation of charge and spin degrees of freedom is established and it is shown that the charge-spin recombination across the ferromagnetic boundary is complete in the supersymmetric t-J model. The charge and spin stiffnesses are expressed in terms of the matrix elements of electronic charge and spin fluctuations between Bethe eigenstates.