Abstract
The spectral function and the momentum distribution for holes in an antiferromagnet are calculated on the basis of the t-J model in a slave-fermion representation. The self-consistent Born approximaton for the two-time Green's function is used to study the temperature and doping (\ensuremath{\delta}) dependence of the self-energy operator. The numerical calculations show a weak concentration and temperature dependence of the spectral function (quasiparticle hole spectrum) while the momentum-distribution function changes dramatically with increasing temperature for Tg${\mathit{T}}_{\mathit{d}}$ with ${\mathit{T}}_{\mathit{d}}$\ensuremath{\simeq}J\ensuremath{\delta}.
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