Quasiparticle Energy Dispersion and Shadow Peaks in a Doped SO(5) Symmetric Ladder

Details Quasiparticle Energy Dispersion and Shadow Peaks in a Doped SO(5) Symmetric Ladder Quasiparticle Energy Dispersion and Shadow Peaks in a Doped SO(5) Symmetric Ladder

1998-07-10

arxiv.org/abs/cond-mat/9807154v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 4 figures

Scientific paper

Mean field and exact diagonalization studies on the quasiparticle excitation of an SO(5) symmetric two-leg ladder system are reported. It is shown that the energy gap in the quasiparticle excitation is caused by the formation of rung singlet states. We find that shadow peaks can occur above the Fermi surface with antiferromagnetic electron correlations involving only rungs in the spin ladder.

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