Dynamic cloaking effect of a vector barrier in bilayer graphene

TL;DR

This paper theoretically investigates the transmission properties of bilayer graphene with magnetic barriers, revealing Fano resonances linked to electronic cloaking effects caused by quantum interference and external periodic potentials.

Contribution

It introduces a novel analysis of Fano resonances and cloaking effects in bilayer graphene with magnetic barriers, highlighting the role of chirality conservation and external time-dependent potentials.

Findings

Identification of asymmetric Fano resonances in transmission spectra.

Verification that cloaking relates to chirality conservation.

Demonstration of external potential influence on charge localization.

Abstract

Transmission profiles in bilayer graphene have been studied theoretically in presence of a pair of delta function magnetic barriers. Two types of asymmetric Fano resonances are discussed in connection to the electronic cloaking effect in graphene nanostructures. One arises in a static (time independent) vector barrier due to the quantum interference between the discrete hole like state inside the barrier and the electron like continuum outside. In this case the computed results for normal incidence indirectly verify that the cloaking effect is a manifestation of the chirality conservation in charge transport through bilayer graphene scalar barriers. While the other arising due to discrete continuum coupling via the exchange of photon under the application of an external time periodic scalar potential. The study of Fano resonances in transmission spectrum is very much urgent in regards of localization of charge carriers in graphene nano structures for its application in digital device fabrication.