Spin signatures in the electrical response of graphene nanogaps

Journal article (2018)

Authors

Victor García-Suárez Universidad de Oviedo

Amador García-Fuente Universidad de Oviedo

Diego J. Carrascal Universidad de Oviedo

E. Burzuri Linares QN/Afdelingsbureau , Kavli institute of nanoscience Delft, IMDEA Materials Institute

M. Koole QN/van der Zant Lab - , Kavli institute of nanoscience Delft

H.S.J. van der Zant QN/van der Zant Lab - , Kavli institute of nanoscience Delft

Maria El Abbassi Swiss Federal Laboratories for Materials Science and Technology (Empa), University of Basel

Michel Calame University of Basel, Swiss Federal Laboratories for Materials Science and Technology (Empa)

Jaime Ferrer Universidad de Oviedo, IMDEA Materials Institute

Research Group

QN/Afdelingsbureau

DOI: https://doi.org/10.1039/c8nr06123h

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Published Date

2018

Language

English

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Research Group

QN/Afdelingsbureau

Abstract

We analyse the electrical response of narrow graphene nanogaps in search for transport signatures stemming from spin-polarized edge states. We find that the electrical transport across graphene nanogaps having perfectly defined zigzag edges does not carry any spin-related signature. We also analyse the magnetic and electrical properties of nanogaps whose electrodes have wedges that possibly occur in the currently fabricated nanogaps. These wedges can host spin polarized wedge low-energy states due to the bipartite nature of the graphene lattice. We find that these spin-polarized low-energy modes give rise to low-voltage signatures in the differential conductance and to distinctive features in the stability diagrams. These are caused by fully spin-polarized currents.

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