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

@article{Cheng2018SingletPA,
  title={Singlet pairing and superconductivity in 
t−J
 ladders with Mott insulating stripes},
  author={Chen Cheng and Rubem P. Mondaini and Marcos Rigol},
  journal={Physical Review B},
  year={2018}
}
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… 
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References

SHOWING 1-10 OF 48 REFERENCES
Spins, stripes, and superconductivity in hole-doped cuprates
One of the major themes in correlated electron physics over the last quarter century has been the problem of high-temperature superconductivity in hole-doped copper-oxide compounds. Fundamental to
Antiferromagnetic Correlations in Two-Dimensional Fermionic Mott-Insulating and Metallic Phases.
TLDR
The uniform magnetic susceptibility of the two-dimensional Hubbard model is determined from simultaneous measurements of the in situ density distribution of both spin components and at half filling and strong interactions the data approach the Heisenberg model of localized spins with antiferromagnetic correlations.
Spin-Gap Proximity Effect Mechanism of High Temperature Superconductivity
When holes are doped into an antiferromagnetic insulator they form a slowly fluctuating array of {open_quotes}topological defects{close_quotes} (metallic stripes) in which the motion of the holes
Bipairing and the stripe phase in four-leg Hubbard ladders
Density Matrix Renormalization Group (DMRG) calculations on 4-leg t-J and Hubbard ladders have found a phase exhibiting "stripes" at intermediate doping. Such behavior can be viewed as generalized
Superconductivity induced by interfacial coupling to magnons
We consider a thin normal metal sandwiched between two ferromagnetic insulators. At the interfaces, the exchange coupling causes electrons within the metal to interact with magnons in the insulators.
A cold-atom Fermi–Hubbard antiferromagnet
TLDR
The results demonstrate that microscopy of cold atoms in optical lattices can help to understand the low-temperature Fermi–Hubbard model and provide a valuable benchmark for numerical simulations.
Observation of spatial charge and spin correlations in the 2D Fermi-Hubbard model
TLDR
The site-resolved observation of charge and spin correlations in the two-dimensional (2D) Fermi-Hubbard model realized with ultracold atoms shows strong bunching of doublons and holes, in agreement with numerical calculations.
Evidence for a superfluid density in t-J ladders.
TLDR
Using a density matrix renormalization group approach, the existence of anomalous flux quantization is shown and the nature of the low-lying excitation modes is considered, finding the 1D analog of the superconducting state.
Thermodynamics versus Local Density Fluctuations in the Metal-Mott-Insulator Crossover.
TLDR
The crossover between a metal and a Mott insulator leads to a localization of fermions from delocalized Bloch states to localized states by measuring thermodynamic and local (on-site) density correlations.
Tunable superfluidity and quantum magnetism with ultracold polar molecules.
TLDR
The tunability and the long-range nature of the interactions in the t-J-V-W model enable enhanced superfluidity and it is shown that Bloch oscillations in a tilted lattice can be used to probe the phase diagram experimentally.
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