Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.44: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Local density of states in clean 2D SNS heterostructures — •Danilo Nikolic¹, Wolfgang Belzig¹, and Juan Carlos Cuevas² — 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. Here, we present a systematic analysis of the local density of states in a clean 2D normal metal coupled to superconducting leads. By solving the Eilenberger equations in the framework of the quasiclassical theory of superconductivity, we are able to describe the impact in the Andreev bound state spectrum of these hybrid systems of, among others, a superconducting phase difference, a finite transmission of the interfaces or the presence of a weak magnetic field. Our results shed light on recent experiments on the Andreev bound states in graphene-based hybrid superconducting structures.

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