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Electronic Properties of Corrugated Bilayer Graphene

AuthorsPelc, M. ; Jaskólski, W.; Ayuela, Andrés ; Chico, Leonor
Issue Date2015
Citation44th "Jaszowiec" International School and Conference on the Physics of Semiconductor (2015)
AbstractThe bilayer graphene in a semiconductor with a zero-energy gap. In the experimental measurements of conductance, however, a transport gap of a few meV may appear. One of the explanations is the appearance of the small surface corrugations that may cause the drop of conductance[1,2]. Here we investigate the bilayer graphene and nanoribbons with the Bernal stacking having single or multiple corrugations. We perform tight -binding calculations using Green function matching technique to study the transport and electronic properties. The conductance calculations across the corrugations show, indeed, that the fold in one layers may lead to the transport gap although only if it causes the stacking change from AB to BA. The origin of the conductance drop is the symmetry change between these two types of lattice stackings. In the system with the gate voltage applied, that opens a conductance gap, we observe the topologically protected localized states bounded to the corrugation region [3]. In the case of large corrugation more localized states appear. These originate from the eigenstates of the long fold. The analysis of the local density of states (LDOS) shows that these states localize mostly around the corrugation region and decay in the bilayer leads with the oscillatory character. This behavior and its dependence on energy is explained with the complex band structure (CBS) calculations. Although, due to their localized character, these states give no contribution to the conductance across the corrugation, they may show a conductive behavior along the orrugation.
DescriptionOral presentation given at the 44th >Jaszowiec> International School and Conference on the Physics of Semiconductor, held in Wisla (Poland) on June 20-25th, 2015.
Appears in Collections:(CFM) Comunicaciones congresos
(ICMM) Comunicaciones congresos
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