Portal de Periódicos da CAPES

Singlet pairing and superconductivity in t − J ladders with Mott insulating stripes

2018; American Physical Society; Volume: 98; Issue: 12 Linguagem: Inglês

10.1103/physrevb.98.121112

2469-9977

Chen Cheng, Rubem Mondaini, Marcos Rigol,

Advanced Condensed Matter Physics

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 novel 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.