Effect of the mixing of s-wave and chiral p-wave pairings on electrical shot noise properties of normal metal/superconductor tunnel junctions

doi:10.1088/1674-1056/ad498a

Abstract We study theoretically the electrical shot noise properties of tunnel junctions between a normal metal and a superconductor with the mixture of singlet s-wave and chiral triplet p-wave pairing due to broken inversion symmetry. We investigate how the shot noise properties vary as the relative amplitude between the two parity components in the pairing potential is changed. It is demonstrated that some characteristics of the electrical shot noise properties of such tunnel junctions may depend sensitively on the relative amplitude between the two parity components in the pairing potential, and some significant changes may occur in the electrical shot noise properties when the relative amplitude between the two parity components is varied from the singlet s-wave pairing dominated regime to the chiral triplet p-wave pairing dominated regime. In the chiral triplet p-wave pairing dominated regime, the ratio of noise power to electric current is close to $2e$ both in the in-gap and in the out-gap region. In the singlet s-wave pairing dominated regime, the value of this ratio is close to $4e$ in the inner gap region but may reduce to about $2e$ in the outer gap region as the relative amplitude of the chiral triplet pairing component is increased. The variations of the differential shot noise with the bias voltage also exhibit some significantly different features in different regimes. Such different features can serve as useful diagnostic tools for the determination of the relative magnitude of the two parity components in the pairing potential.

Keywords: normal metal/superconductor tunnel junctions shot noise mixing of s-wave and chiral p-wave pairing spin-orbit coupling

Received: 28 December 2023
Revised: 20 April 2024
Accepted manuscript online: 10 May 2024

PACS:	72.10.Bg	(General formulation of transport theory)
	72.25.Dc	(Spin polarized transport in semiconductors)
	72.25.Ba	(Spin polarized transport in metals)
	72.15.-v	(Electronic conduction in metals and alloys)

Corresponding Authors: Liang-Bin Hu
E-mail: lbhu26@126.com

Cite this article:

Yu-Chen Hu(胡雨辰) and Liang-Bin Hu(胡梁宾) Effect of the mixing of s-wave and chiral p-wave pairings on electrical shot noise properties of normal metal/superconductor tunnel junctions 2024 Chin. Phys. B 33 077202

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Effect of the mixing of s-wave and chiral p-wave pairings on electrical shot noise properties of normal metal/superconductor tunnel junctions

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