Resonance Transmission in Graphene-Nanoribbon-Based Quantum Dot and Superlattice

Abstract

By using a decomposition elimination method for Green's function, the transport properties of Graphenenanoribbon-based quantum dot (QD) and/or QD superlattice are studied. It is shown that relatively small changes of both QD size and magnetic field intensity can induce strong variations in the electron transmission across the structure. For a QD device, electrons can be either totally reflected or totally transmitted through the QD region at some energies, and the quasibound peaks have been observed to have a small shift due to quasibound state energy varying. In the case of QD superlattice, the electrons within the miniband energy region can transmit through a device, similar to a QD device. Therefore, the transmission spectrum can be tailored to match with requirement by modulating the size of quantum dot and the number 𝑝 of superlattce.

Charge transport through the multiple end zigzag edge states of armchair graphene nanoribbons and heterojunctions

“…Additionally, if one adopts the alternative denition of G LðRÞ ð3Þ ¼ Ài½ P r LðRÞ ð3Þ À P a LðRÞ ð3Þ, the factor "4 00 in the transmission coefficient is reset to one. [31][32][33] Notably, G L(R) calculated within the wide-band limit can effectively replicate the transmission coefficient curves of graphene nanoribbon superlattices obtained using the surface Green's function method, as demonstrated in ref. 32 and 33.…”

“… 31–33 Notably, Γ L(R) calculated within the wide-band limit can effectively replicate the transmission coefficient curves of graphene nanoribbon superlattices obtained using the surface Green's function method, as demonstrated in ref. 32 and 33 .…”