Strengthened correlations near [110] edges of d-wave superconductors in the t−J model with the Gutzwiller approximation
A. Joki, M. Fogelström, T. Löfwander
DOI 10.1103/5bl6-g7x4 · Physical Review B
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Abstract
We report results of a study of strongly correlated d-wave superconducting slabs within a t-J model solved using the statistically consistent Gutzwiller approach. For different dopings, we model slabs cut at 45∘ relative to the main crystallographic ab axes, i.e., [110] orientation, and conclude that quasiparticle charge is drawn to the edges. Thus, the correlations are locally strengthened, and a region near the edge is closer to the Mott- insulating state with reduced hopping amplitudes on the links. Superconductivity is locally weakened near the edges in the correlated state, and the spectral weight of zero-energy Andreev bound states is substantially reduced compared to weak coupling theory. The renormalization of the edge states leaves no room for an extended s-wave component to form for hole dopings ranging from strongly underdoped to slightly overdoped.
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