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Aharonov–Bohm interferences in polycrystalline graphene

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Abstract

Aharonov–Bohm (AB) interferences in the quantum Hall regime can be achieved, provided that electrons are able to transmit between two edge channels in nanostructures. Pioneering approaches include quantum point contacts in 2DEG systems, bipolar graphene pn junctions, and magnetic field heterostructures. In this work, defect scattering is proposed as an alternative mechanism to achieve AB interferences in polycrystalline graphene. Indeed, due to such scattering, the extended defects across the sample can act as tunneling paths connecting quantum Hall edge channels. Consequently, strong AB oscillations in the conductance are predicted in polycrystalline graphene systems with two parallel grain boundaries. In addition, this general approach is demonstrated to be applicable to nano-systems containing two graphene barriers with functional impurities and perspectively, can also be extended to similar systems of 2D materials beyond graphene.

Graphical abstract: Aharonov–Bohm interferences in polycrystalline graphene

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Publication details

The article was received on 29 Aug 2019, accepted on 13 Nov 2019 and first published on 19 Nov 2019


Article type: Paper
DOI: 10.1039/C9NA00542K
Nanoscale Adv., 2020, Advance Article
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    Aharonov–Bohm interferences in polycrystalline graphene

    V. H. Nguyen and J.-C. Charlier, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/C9NA00542K

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