Electron transport and quantum-dot energy levels in Z-shaped graphene nanoconstriction with zigzag edges - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: Motivated by recent advances in fabricating graphene nanostructures, we findthat an electron can be trapped in Z-shaped graphene nanoconstriction withzigzag edges. The central section of the constriction operates as asingle-level quantum dot, as the current flow towards the adjunct sectionsrotated by 60 degree is strongly suppressed due to mismatched valleypolarization, although each section in isolation shows maximal quantum value ofthe conductance $G 0=2e^2-h$. We further show, that the trapping mechanism isinsensitive to the details of constriction geometry, except from the case whenwidths of the two neighboring sections are equal. The relation with earlierstudies of electron transport through symmetric and asymmetric kinks withzigzag edges is also established.



Autor: Adam Rycerz

Fuente: https://arxiv.org/







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