Charge transport in normal metal/s+ps+p-wave superconductor junctions with Rashba type spin–orbit coupling

We study charge transport in normal metal/s+ps+p-wave superconductor (S+P) junctions with Rashba type spin–orbit coupling (RSOC). Applying the Blonder–Tinkham–Klapwijk theory, we calculate a bias (V)(V) dependence of tunneling conductance, changing the strength of RSOC and Δp/ΔsΔp/Δs. Here Δs(p)Δs(p) is the absolute value of pair potential of S(P) component. For Δp<ΔsΔp<Δs, a gap structure appears ranging from eV=0eV=0 to eV=|Δs-Δp|eV=|Δs-Δp|, and a coherent peak appears at eV=|Δs+Δp|eV=|Δs+Δp|. For Δp>ΔsΔp>Δs, a zero bias conductance peak (ZBCP) is formed, a dip structure appears at |Δs-Δp||Δs-Δp|, and a weak coherent peak appears at eV=|Δs+Δp|eV=|Δs+Δp|. For large RSOC, a weak peak appears at eV=|Δs-Δp|eV=|Δs-Δp| because of RSOC. The bias dependence of conductance depends on the ratio Δp/ΔsΔp/Δs and changes qualitatively at Δp/Δs=1Δp/Δs=1. For Δp>ΔsΔp>Δs, |Δs-Δp||Δs-Δp| can be estimated from a width of ZBCP. For Δs>ΔpΔs>Δp, ΔsΔs and ΔpΔp can be estimated from the gap structure and the coherent peak. Thus, the magnitude of gaps can be determined from the experiment of scanning tunneling spectroscopy.