Shot noise in a normal-metal–d-wave superconductor junction with a {110}-oriented interface
Jian-Xin Zhu, C. S. Ting
DOI 10.1103/PhysRevB.59.R14165 · Physical Review B
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Abstract
The current fluctuations in a normal-metal–dxa2−xb2-wave superconductor junction with a {110}-oriented interface are investigated based on the scattering formalism. Our study exhibits an important consequence of the sign change of the d-wave order parameter. In the ballistic junction, the shot-noise power is finite within the maximum energy gap. In particular, in the tunneling limit, the noise-to-current ratio is zero at zero bias and quickly reaches the classical Schottky value 2e at a finite bias. If the tunneling barrier resides several coherence lengths away from the superconductor surface, more resonant-peak structures appear in the differential shot-noise power. The predicted current fluctuation behaviors are qualitatively different from those in a normal-metal–s-wave superconductor junction.
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