Gate tunable layer selectivity of transport in bilayer graphene nanostructures

Abstract

Recently it was found that bilayer graphene may exhibit regions with and without van der Waals coupling between the two layers. We show that such structures can exhibit a strong layer selectivity when current flows through the coupled region and that this selectivity can be tuned by means of electrostatic gating. Analysing how this effect depends on the type of bilayer stacking, the potential on the gates and the smoothness of the boundary between the coupled and decoupled regions, we show that nearly perfect layer selectivity is achievable in these systems. This effect can be further used to realise a tunable layer switch.

Landau levels in biased graphene structures with monolayer-bilayer interfaces

“…The LLs of biased BLG for the K valley can be obtained from Eq. (18). At high energies, as well as in the case of narrow ribbons, e.g., W 3 , the energy levels show an oscillatory behavior and coincide no longer with the biased BLG LLs.…”

“…[17]. Transport properties of BLG with locally decoupled graphene sheets have also been investigated theoretically [18]. Another study was devoted to a hybrid quantum dot (QD) structure made of MLG-BLG junctions [19].…”

Band gap engineering in AA-stacked bilayer graphene

“…with n = 0, 1, 2..., and η = (0, 1/2) for T i i and T j i , respectively. Such oscillation was also observed within domain walls in delaminated bilayer graphene 7 . Note that the location of these maxima is independent of the Fermi energy.…”

“…Eventually, it is worth to mention that the cloaking effect presents in gapless 51 and gapped 50 AB-BLG is absent in AA-BLG as can be deduced from Figs. (5,7).…”

“…Moreover, bilayer graphene exists in two different types of stacking, namely, AB-(Bernal) and AA stackings (AB-BLG and AA-BLG). The stability of AB-BLG made it the subject of considerable investigations, both theoretical and experimental [5][6][7] . On the contrary to the previous belief that AA-BLG samples are unstable, recent stable samples were realized [8][9][10][11] .…”