Abstract
Antiferromagnetic spin-1/2 double-chain ladders have a finite spin gap. Doping a small number of holes into such a system is expected to lead to an Luther-Emery liquid, characterized by gapless charge excitations and gapped spin excitations. Charge and magnetic properties of lightly doped ladders are studied by exact diagonalization of thet-J model. Effective interactions between doped holes are examined for the discussion of possibility superconductivity-dominant phase.
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