Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-11
Phys. Rev. B 82, 140509(R) (2010)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures
Scientific paper
10.1103/PhysRevB.82.140509
We theoretically study the Shapiro steps in a hetero Josephson junction made of a single-gap superconductor and a two-gap one. We find that an anomalous DC Josephson current is induced by tuning the frequency of an applied microwave to the Josephson-Leggett mode frequency, which creates an extra step structure in the $I$-$V$ characteristics besides the conventional Shapiro steps. The step heights at the resonance voltages exhibit an alternate structure of a large and small value reflecting the gap symmetry of the two-gap superconductor. In the $\pm s-wave case in which the two gaps have opposite signs in the two-gap superconductor the steps with odd index are enhanced, whereas in the s-wave case the ones with even index have larger values. The existence of the fractional Shapiro steps is also predicted.
Koyama Tomio
Machida Masahiko
Ota Yukihiro
No associations
LandOfFree
Shapiro Steps as a Direct Probe of $\pm s$-wave Symmetry in Multi-gap Superconducting Josephson Junctions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Shapiro Steps as a Direct Probe of $\pm s$-wave Symmetry in Multi-gap Superconducting Josephson Junctions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shapiro Steps as a Direct Probe of $\pm s$-wave Symmetry in Multi-gap Superconducting Josephson Junctions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-76787