Photoemission spectra in $t-J$ ladders with two legs

Photoemission spectra for the isotropic two-leg $t-J$ ladder are calculated at various hole-doping levels using exact diagonalization techniques. Low-energy sharp features caused by short-range antiferromagnetic correlations are observed at finite doping levels close to half-filling, above the naive Fermi momentum. These features should be observable in angle-resolved photoemission experiments. In addition, the formation of a $d$-wave pairing condensate as the ratio $\frac{J}{t}$ is increased leads to dynamically generated spectral weight for momenta close to $k_F$ where the $d_{x^2-y^2}$ order parameter is large.