Strongly Enhanced Superconductivity in Coupled t−J Segments
Sahinur Reja, Jeroen van den Brink, Satoshi Nishimoto
DOI 10.1103/PhysRevLett.116.067002 · Physical Review Letters
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Abstract
The t−J Hamiltonian is one of the cornerstones in the theoretical study of strongly correlated copper-oxide based materials. Using the density-matrix renormalization group method we obtain the phase diagram of the one-dimensional t−J chain in the presence of a periodic hopping modulation, as a prototype of coupled-segment models. While in the uniform 1D t−J model the near half-filling superconducting state dominates only at unphysically large values of the exchange coupling constant J/t>3; we show that a small hopping and exchange modulation very strongly reduces the critical coupling to be as low as J/t∼1/3—well within the physical regime. The phase diagram as a function of the electron filling also exhibits metallic, insulating line phases and regions of phase separation. We suggest that a superconducting state is easily stabilized if t−J segments creating local spin-singlet pairing are coupled to each other—another example is the ladder system.
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