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The tunneling conductance spectra of a normal metal / insulator / singletsuperconductor is calculated from the reflection amplitudes using theBlonder-Tinkham-Klapwijk (BTK) formulation. The pairing symmetry of thesuperconductor is assumed to be $d_{x^2-y^2}+is$, or $d_{x^2-y^2}+id_{xy}$. Itis found that in the ($d_{x^2-y^2}+is$)-wave case there is a well definedconductance peak in the conductance spectra, in the amplitude of the secondarys-wave component. In the ($d_{x^2-y^2}+id_{xy}$)-wave case the tunnelingconductance has residual values within the gap, due to the formation of boundstates. The bound state energies depend on the angle of the incidentquasiparticles, and also on the boundary orientation. On the basis of thisobservation an electron focusing experiment is proposed to probe the($d_{x^2-y^2}+id_{xy}$)-wave state.Comment: 17 pages with 9 figure

journal of physics. condensed matter

Tunnelling spectra for (dx2-y2+ is)-wave superconductors versus tunnelling spectra for (dx2-y2+ idxy)-wave superconductors