Finite-temperature spectral functions of strongly correlated one-dimensional electron systems

The spectral functions of tJ and tJ(XY) models in the limit of J/t-->0 and at finite temperatures T much less than t are calculated using the spin-charge factorized wave function. We find that the Luttinger-liquid-like scaling behavior for a finite system with L sites is restricted below temperatures of the order T less than or similar to J/L. We also observe a weight redistribution in the photoemission spectral function in the energy range t, which is much larger than the temperature.