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

✍ Scribed by Y. Sawa; T. Yokoyama; Y. Tanaka; C. Iniotakis; N. Hayashi; M. Sigrist

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 160 KB
• Volume: 40
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2007.06.039

✦ Synopsis

We study charge transport in normal metal/s þ p-wave superconductor (S+P) junctions with Rashba type spin-orbit coupling (RSOC). Applying the Blonder-Tinkham-Klapwijk theory, we calculate a bias ðV Þ dependence of tunneling conductance, changing the strength of RSOC and D p =D s . Here D sðpÞ is the absolute value of pair potential of S(P) component. For D p oD s , a gap structure appears ranging from eV ¼ 0 to eV ¼ jD s À D p j, and a coherent peak appears at eV ¼ jD s þ D p j. For D p 4D s , a zero bias conductance peak (ZBCP) is formed, a dip structure appears at jD s À D p j, and a weak coherent peak appears at eV ¼ jD s þ D p j. For large RSOC, a weak peak appears at eV ¼ jD s À D p j because of RSOC. The bias dependence of conductance depends on the ratio D p =D s and changes qualitatively at D p =D s ¼ 1. For D p 4D s , jD s À D p j can be estimated from a width of ZBCP. For D s 4D p , D s and D p 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.