Low-bias flat band-stop filter based on velocity modulated gaussian graphene superlattice. (May 2018)

• Record Type: Journal Article
• Authors: Sattari-Esfahlan, S.M.; Shojaei, S.
• Is Part Of: Solid state communications. Volume 273(2018)
• Page Start: 66
• Page End: 72
• Publication Date: 2018-05
• Subjects: Band-stop filter -- Gussian graphene superlattice -- Biased graphene superlattice -- Velocity modulation filter -- Flat-band filter -- Fermi velocity; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2017.08.005
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: Transport properties of biased planar Gaussian graphene superlattice (PGGSL) with Fermi velocity barrier is investigated by transfer matrix method (TMM). It is observed that enlargement of bias voltage over miniband width breaks the miniband to WSLs leads to suppressing resonant tunneling. Transmission spectrum shows flat wide stop-band property controllable by external bias voltage with stop-band width of near 200 meV. The simulations demonstrate that strong velocity barriers prevent tunneling of Dirac electrons leading to controllable enhancement of stop-band width. By increasing ratio of Fermi velocity in barriers to wells υ c stop-band width increase. As wide transmission stop-band width ( BW T ) of filter is tunable from 40 meV to 340 meV is obtained by enhancing ratio of υ c from 0.2 to 1.5, respectively. Proposed structure suggests easy tunable wide band-stop electronic filter with a modulated flat stop-band characteristic by height of electrostatic barrier and structural parameters. Robust sensitivity of band width to velocity barrier intensity in certain bias voltages and flat band feature of proposed filter may be opens novel venue in GSL based flat band low noise filters and velocity modulation devices. Highlights: Novel device architectures based on biased planar graphene superlattice with Gaussian band structure. Fermi velocity modulation as novel and easy control agent for band width adjusting. Bias voltage as novel and very effective control agent to adjusting band width. Gaussian band structure leads to flat band filter. Low power flat band filter. Least attenuation in transmission band and appropriate interference elimination for communication and radar applications.