Strain-induced modifications of transport in gated graphene nanoribbons

Cosma, Diana and Mucha-Kruczynski, Marcin and Schomerus, Henning and Falko, Vladimir (2014) Strain-induced modifications of transport in gated graphene nanoribbons. Physical Review B: Condensed Matter and Materials Physics, 90: 245409. ISSN 1098-0121

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We investigate the effects of homogeneous and inhomogeneous deformations and edge disorder on the conductance of gated graphene nanoribbons. Under increasing homogeneous strain the conductance of such devices initially decreases before it acquires a resonance structure and, finally, becomes completely suppressed at higher strain. Edge disorder induces mode mixing in the contact regions, which can restore the conductance to its ballistic value. The valley-antisymmetric pseudomagnetic field induced by inhomogeneous deformations leads to the formation of additional resonance states, which originate either from the coupling into Fabry-Pérot states that extend through the system or from the formation of states that are localized near the contacts, where the pseudomagnetic field is largest. In particular, the n=0 pseudo-Landau level manifests itself via two groups of conductance resonances close to the charge neutrality point.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review B: Condensed Matter and Materials Physics
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©2014 American Physical Society
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Deposited On:
08 Dec 2014 09:10
Last Modified:
31 Dec 2023 00:32