Fano resonances in bilayer graphene superlattices

Abstract

In this work, we address the ubiquitous phenomenon of Fano resonances in bilayer graphene. We consider that this phenomenon is as exotic as other phenomena in graphene because it can arise without an external extended states source or elaborate nano designs. However, there are not theoretical and/or experimental studies that report the impact of Fano resonances on the transport properties. Here, we carry out a systematic assessment of the contribution of the Fano resonances on the transport properties of bilayer graphene superlattices. Specifically, we find that by changing the number of periods, adjusting the barriers height as well as modifying the barriers and wells width it is possible to identify the contribution of Fano resonances on the conductance. Particularly, the coupling of Fano resonances with the intrinsic minibands of the superlattice gives rise to specific and identifiable changes in the conductance. Moreover, by reducing the angular range for the computation of the transport properties it is possible to obtain conductance curves with line-shapes quite similar to the Fano profile and the coupling profile between Fano resonance and miniband states. In fact, these conductance features could serve as unequivocal characteristic of the existence of Fano resonances in bilayer graphene.

Quenching effect of oscillating potential on anisotropic resonant transmission through a phosphorene electrostatic barrier

“…5 b). However, in most of the earlier works 43 the characteristic FR was poorly reflected at the conductance level in case of bilayer graphene (BLG) because this distinctive signature smears out due to method of the angular integration of the transmittance. This indicates the demand of the measurement at the differential level of the conductance 43 .…”

“…However, in most of the earlier works 43 the characteristic FR was poorly reflected at the conductance level in case of bilayer graphene (BLG) because this distinctive signature smears out due to method of the angular integration of the transmittance. This indicates the demand of the measurement at the differential level of the conductance 43 . In the present case, however, peak of the FR in the conductance is pronounced and the position ( ) coincides with that for the case of normal incidence (at the transmittance level) as expected, although the (non-zero) conductance minimum of the FR does not correspond to the corresponding (zero) minimum of the transmission profile.…”

Enhancement of the thermoelectric properties in bilayer graphene structures induced by Fano resonances

“…Among these effects we can find anti-Klein tunneling 32 , 33 , cloaked states 33 , 34 , and Fano and hybrid resonances 35 – 39 . In the case of Fano resonances, it is known that they are related to the chiral nature of electrons in bilayer graphene 33 , 34 , 38 . In particular, they arise due to the chiral matching between electron states inside and outside electrostatic barriers at oblique incidence 35 – 38 , 40 .…”

“…In the case of Fano resonances, it is known that they are related to the chiral nature of electrons in bilayer graphene 33 , 34 , 38 . In particular, they arise due to the chiral matching between electron states inside and outside electrostatic barriers at oblique incidence 35 – 38 , 40 . On its side, hybrid resonances are the result of the coupling between Fano resonances and resonant states in double and superlattice barrier structures 38 , 40 .…”

Quantum control of nonlinear thermoelectricity at the nanoscale

“…31 and references therein). Experimental realizations of tunable Fano resonances include semiconductor quantum dots [32][33][34][35] or molecular junctions 36 as well as engineered graphenes or nanoribbons [37][38][39][40][41][42] . It is noteworthy that quantum coherence in some single-molecule junctions remains not only at low temperatures but also at room temperature [43][44][45][46][47][48][49] .…”