Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 55: Superconductivity: Tunneling and Josephson Junctions

TT 55.9: Talk

Thursday, April 4, 2019, 11:45–12:00, H23

Local density of states in clean 2D SNS heterostructures — •Danilo Nikolic¹, Juan Carlos Cuevas², and Wolfgang Belzig¹ — ¹Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — ²Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain

The advent of 2D materials like graphene have reignited the interest in the study of the proximity effect in clean hybrid superconducting structures. Motivated by the recent experimental results [1] we present a systematic theoretical analysis of the local density of states in a clean 2D normal metal sandwiched between two standard s-wave superconductors. By solving the Eilenberger equation in the framework of quasiclassical Green’s function theory we are able to describe the Andreev bound state spectrum in presence of, among others, a finite transparency of the junction or a weak magnetic field with different geometries of the junction. We analytically obtain a relation between the supercurrent and the global density of states.

[1] L. Bretheau, J.I.J. Wang, R. Pisoni, K. Watanabe, T. Taniguchi, P. Jarillo-Herrero, Nature Physics, doi:10.1038/nphys4110 (2017)