We discuss exact results for the quasiparticle bandwidth W of a single dopant-induced hole carrier in finite two-dimensional t-J-model clusters with up to 16 square lattice sites. Our results indicate a substantial band narrowing with W/t varying approximately as exp(-const×{}t/J) over a wide parameter range. We show that our results can be interpreted as a polaronic-carrier self-localization effect for which a simple scaling theory is developed. We also compare our results to recent analytical work.
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Chen et al. (1990) studied this question.
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