MONTE-CARLO STUDY OF ONE-HOLE BAND-STRUCTURE IN THE T-J MODEL

We present Monte Carlo results for the band structure of the lowest-lying S(tot) = 1/2 one-hole band in the t-J model on 4 x 4 and 6 x 6 lattices. In this paper we report measurements for all k states in the small t/J regime 0 less-than-or-equal-to t/J less-than-or-equal-to 0.2, and extrapolate to 0 less-than-or-equal-to t/J less-than-or-equal-to 0.5. Our results support the conjecture that the linear-t component of the bandwidth at small t/J vanishes as kappa/L2 in the bulk limit, as was anticipated on theoretical grounds; this implies that the propagation of isolated holes is strongly hindered by the staggered magnetization of the ground state. For this initial study we used a very simple trial wave function for importance sampling; it should be possible to obtain comparably accurate Monte Carlo results for band structure at appreciably larger t/J with improved importance sampling.