Marshall sign and the doped $t-J$ model

Details Marshall sign and the doped $t-J$ model Marshall sign and the doped $t-J$ model

1995-06-15

arxiv.org/abs/cond-mat/9506070v1

Physics

Condensed Matter

11 pages, RevTex, no figures

Scientific paper

Marshall sign as a sole source of sign problem hidden in an antiferromagnet is explored under doping. By tracking the Marshall sign, a zero spectral weight $Z$ is revealed in the doped antiferromagnetic system. $Z=0$ is caused by a phase string induced by the ``bare'' hole. By eliminating such a phase string through nonlocal transformations, a non-perturbative scheme is obtained. It is argued that this formalism provides a unique way to get access to the real ground state of the doped $t-J$ model for both one- and two-dimensions.

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