Single-hole spectral function and spin-charge separation in the t-J model -: art. no. 033101

Worm algorithm Monte Carlo simulations of the hole Green function with subsequent spectral analysis were performed for 0.1 less than or equal toJ/t less than or equal to0.4 on lattices with up to LxL=32x32 sites at a temperature as low as T=J/40, and present, apparently, the hole spectral function in the thermodynamic limit. Spectral analysis reveals a S-function-sharp quasiparticle peak at the lower edge of the spectrum that is incompatible with the power-law singularity and thus rules out the possibility of spin-charge separation in this parameter range. Spectral continuum features two peaks separated by a gap similar to4 divided by5 t.