We have calculated the high temperature series for the momentum distribution function nₖ of the 2D t-J model to twelfth order in inverse temperature. By extrapolating the series to T0ex0ex=0ex0ex0.2J we searched for a Fermi surface of the 2D t-J model. We find that three criteria used for estimating the location of a Fermi surface violate Luttinger's theorem, implying that the t-J model does not have an adiabatic connection to a noninteracting model.
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Putikka et al. (1998) studied this question.
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