Conductance Spectroscopy of Spin-triplet Superconductors
Yasuhiro Asano, Yukio Tanaka, Alexander A. Golubov, and Satoshi, Kashiwaya
TL;DR
This paper proposes an experimental method to distinguish between spin-singlet and spin-triplet superconductors by analyzing differential conductance, highlighting the role of odd-frequency pairing in triplet cases.
Contribution
It introduces a theoretical framework for conductance spectroscopy that can identify superconducting pairing symmetry based on proximity effects.
Findings
Differential conductance varies significantly with pairing symmetry.
Odd-frequency pairing leads to unique conductance signatures in spin-triplet superconductors.
The method provides a clear experimental distinction between singlet and triplet superconductivity.
Abstract
We propose a novel experiment to identify the symmetry of superconductivity on the basis of theoretical results for differential conductance of a normal metal connected to a superconductor. The proximity effect from the superconductor modifies the conductance of the remote current depending remarkably on the pairing symmetry: spin-singlet or spin-triplet. The clear-cut difference in the conductance is explained by symmetry of Cooper pairs in a normal metal with respect to frequency. In the spin-triplet case, the anomalous transport is realized due to an odd-frequency symmetry of Cooper pairs.
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