Photoemission Spectra in t-J Ladders with Two Legs

Abstract

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 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.

9 pages, RevTex, to be published in Phys. Rev. B (RC)

References in corpus (4)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Evidence for a superfluid density in t--J ladders
• Quasiparticle dispersion of the t-J and Hubbard models
• Predictions for Neutron Scattering and Photoemission Experiments on CuGeO_3

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• Single-hole dynamics in dimerized and frustrated spin-chains
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• The spectral function of Mott-insulating Hubbard ladders: From fractionalized excitations to coherent quasi-particles
• Hole-Density Evolution of the One-Particle Spectral Function in Doped Ladders
• The fate of pairing and spin-charge separation in the presence of long-range antiferromagnetism