Quantum point contact conductance in normal metal/insulator/ metal/ mixed wave superconductor junctions

✍ Scribed by Jianwen Wei

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 398 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.01.010

✦ Synopsis

The tunneling conductance in a normal metal/insulator/metal/d x 2 -y 2 + id xy mixed wave superconductor (N/I/N/d x 2 -y 2 + id xy ) junction is calculated, where the N/I/N region is a quantum wire. It is found in the single-mode case that the magnitude of the tunneling conductance near zero voltage is enhanced due to the Andreev bound state by quasiparticles with perpendicular and horizontal injection, and the zero-bias conductance varies with L (L is the distance from insulating layer to the interface of N/d x 2 -y 2 + id xy mixed wave superconductor). Splitting of the zero-bias conductance peak appears in the quantum point contact tunneling spectra for an N/I/N/d x 2 -y 2 + id xy junction, and several subgap peaks can split at the same time. On increasing both L and the magnitude ratio of the two components for the d x 2 -y 2 + id xy mixed wave, the subgap resonances exhibit an alternately high and low behavior inside the energy gap. These results are different from those in d-wave and p-wave superconductor junctions.