Singlet pairing and superconductivity in t−J ladders with Mott insulating stripes
Chen Cheng, Rubem Mondaini, Marcos Rigol
DOI 10.1103/PhysRevB.98.121112 · Physical Review B
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Abstract
Pairing in superconductors occurs in a variety of channels and can be produced by various mechanisms. Here, we show that, in the presence of strong correlations, a singlet-pair superconducting phase can occur in ladder geometries with the fermions in the pairs residing on different sides of a Mott insulating stripe. The antiferromagnet correlations in the Mott stripe provide the pairing “glue” in such a phase. We study, using the density matrix renormalization group method, the ground state of four-leg t−J ladders with Mott insulating stripes in the inner two legs. Pairing and superconductivity are revealed by the presence of negative binding energies and by algebraically decaying interleg singlet-pair correlations, respectively.
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