Hole-density evolution of the one-particle spectral function in doped ladders
نویسندگان
چکیده
The spectral function A(q,v) of doped t-J ladders is presented on clusters with up to 2320 sites at zero temperature applying a recently developed technique that uses up to ;6310 rung-basis states. Similarities with photoemission results for the two-dimensional cuprates are observed, such as the existence of a gap at (p ,0) near half-filling ~caused by hole pair formation! and flat bands in its vicinity. These features should be observable in angle-resolved photoemission spectroscopy experiments on ladders. The main result of the paper is the nontrivial evolution of the spectral function from a narrow band at x50, to a quasinoninteracting band at x>0.5. It was also observed that the low-energy peaks of a cluster spectra acquire finite linewidths as their energies move away from the chemical potential. @S0163-1829~99!08621-X#
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