Theory of Local Density of States of d-Wave Superconducting State Near the Surfaces of the t-J Model

Abstract

Spatial dependencies of the pair potential and the local density of states near the surfaces of $d_{x^2-y^2}$-wave superconductors are studied theoretically. The calculation is based on the t-J model within a mean-field theory with Gutzwiller approximation. Various types of surface geometries are considered. Similar to our result in the extended Hubbard model, it is found that the formation of zero-energy states strongly depends on the surface geometry. In addition to this feature, the zero-energy states give peak splitting for the (110) surfaces when the super-exchange interaction $J$ is large. This is due to the induced s-wave component near the surface. The present result explains the microscopic origin of the spontaneous time- reversal symmetry breaking at the surfaces of high-$T_c$ superconductors.

8 pages, 3 figures, to appear in Journal of the Physical Society of Japan Vol.67 No.4

References in corpus (2)

• Tunneling into Current-Carrying Surface States of High T${}_c$ Superconductors
• Quasiparticle Bound States and Low-Temperature Peaks of the Conductance of NIS Junctions in d-Wave Superconductors

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