Identification of odd-frequency superconducting pairing in Josephson junctions
Subhajit Pal, Aabir Mukhopadhyay, Vivekananda Adak, Sourin Das
DOI 10.1103/PhysRevB.109.L220504 · Physical Review B
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Abstract
Optimal choice of spin polarization enables electron injection into the helical edge state at a precise position, despite the uncertainty principle, permitting access to specific nonlocal Green's functions. We show, within 1D effective description, that this fact facilitates a direct identification of odd-frequency pairing through parity measurement (under frequency reversal) of the nonlocal differential conductance in a setup comprising the Josephson junction on the helical edge state of a 2D topological insulator with two spin-polarized probes tunnel-coupled to the junction region. A 2D numerical simulation has also been conducted to confirm theoretical predictions as well as to demonstrate the experimental feasibility of the proposal.
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