Dirac-fermions and conductance-oscillations in (s,d)-wave superconductor/normal graphene junctions

TL;DR

This paper studies quantum transport in graphene heterostructures with anisotropic (d-wave) superconducting regions, revealing oscillatory conductance behavior influenced by pairing symmetry and graphene's electronic structure.

Contribution

It introduces the analysis of conductance oscillations in graphene heterostructures with anisotropic superconductivity, highlighting the effects of d-wave pairing symmetry on transport properties.

Findings

Conductance exhibits undamped oscillations as a function of bias voltage.

d-wave pairing symmetry significantly alters the conductance spectra.

Unusual electronic features of graphene influence the impact of superconducting pairing symmetry.

Abstract

We investigate quantum transport in a normal/superconductor graphene heterostructure, including the possibility of an anisotropic pairing potential in the superconducting region. We find that under certain circumstances, the conductance displays an undamped, oscillatory behaviour as a function of applied bias voltage. Also, we investigate how the conductance spectra are affected by a d-wave pairing symmetry. These results combine unusual features of the electronic structure of graphene with the unconventional pairing symmetry found for instance in high-T_c superconductors.