Exact ground and excited states of a t-j ladder doped with two holes

Bose, Indrani ; Gayen, Saurabh (1999) Exact ground and excited states of a t-j ladder doped with two holes Journal of Physics: Condensed Matter, 11 (33). pp. 6427-6437. ISSN 0953-8984

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Official URL: http://iopscience.iop.org/0953-8984/11/33/311

Related URL: http://dx.doi.org/10.1088/0953-8984/11/33/311


A two-chain ladder model is considered that is described by the strong-coupling t-t'-J-J' Hamiltonian. For the case of two holes moving in a background of antiferromagnetically interacting spins, exact, analytical results are derived for the ground-state energy and low-lying excitation spectrum. The ground state is a bound state of two holes with total spin S = 0. The charge excitation is gapless and the spin excitation has a gap. The corresponding wave functions are also exactly determined. The bound hole pair is found to have symmetry of the d-wave type. In the limit of strong rung coupling, the model maps onto an effective hard-core-boson model which exhibits dominant superconducting pairing correlations.

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ID Code:5968
Deposited On:19 Oct 2010 10:02
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