Quasi-excitations and superconductivity in the t-J model on a ladder
Abstract
We study the t-J model on a ladder by using slave-fermion-CP1 formalism which is quite useful for study of lightly-doped high-Tc cuprates. By integrating half of spin variables, we obtain a low-energy effective field theory whose spin part is nothing but CP1 sigma model. We especially focus on dynamics of composite gauge field which determines properties of quasi-excitations. Value of the coefficient of the topological term strongly influences gauge dynamics and explaines why properties of quasi-excitations depend on the number of legs of ladder. We also show that superconductivity appears as a result of short-range antiferromagnetism and order parameter has d-wave type symmetry.
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