Magnetic field effect on tunneling through triple barrier in AB bilayer graphene

Autor: Saley, Mouhamadou Hassane, Jellal, Ahmed
Rok vydání: 2023
Předmět:
Zdroj: Comput. Mater. Sci. 233 (2024) 112711
Druh dokumentu: Working Paper
DOI: 10.1016/j.commatsci.2023.112711
Popis: We investigate electron tunneling in AB bilayer graphene through a triple electrostatic barrier of heights $U_i (i=2,3,4)$ subjected to a perpendicular magnetic field. By way of the transfer matrix method and using the continuity conditions at the different interfaces, the transmission probability is determined. Additional resonances appear for two-band tunneling at normal incidence, and their number is proportional to the value of $U_4$ in the case of $U_2U_4$, anti-Klein tunneling increases with $U_2$. The transmission probability exhibits an interesting oscillatory behavior when $U_3>U_2=U_4$ and $U_3 U_2=U_4$. In the four-band tunneling case, the transmission decreases in $T^+_+$, $T^-_+$ and $T^-_-$ channels in comparison with the single barrier case. It does, however, increase for $T^+_-$ when compared to the single barrier case. Transmission is suppressed in the gap region when an interlayer bias is introduced. This is reflected in the total conductance $G_{\text{tot}}$ in the region of zero conductance. Our results are relevant for electron confinement in AB bilayer graphene and for the development of graphene-based transistors.
Comment: 14 pages, 7 figures. Clarification and references added
Databáze: arXiv
Externí odkaz: