https://doi.org/10.1140/epjb/s10051-022-00297-x
Regular Article - Solid State and Materials
Geometry dependent current–voltage characteristics of T-stub zigzag-edged graphene nanoribbon quantum waveguides
College of Electrical and Electronic Engineering, Wenzhou University, 325035, Wenzhou, China
Received:
31
October
2021
Accepted:
7
February
2022
Published online:
24
February
2022
Zigzag-edged graphene nanoribbon (ZGNR) has great potential in designing quantum waveguide devices to conduct electric currents metallically. Using non-equilibrium Green’s function (NEGF) method, we theoretically study geometry dependent transport properties and current–voltage (I–V) characteristics of T-stub ZGNR quantum waveguides sized in tens of nanometers. Instead of the perfect transmission in straight ZGNR, anti-resonance effects appear in transmission spectrum due to strong electronic reflection depending on the size of central region in T-stub ZGNR. In addition, the I–V characteristics of T-stub ZGNR quantum waveguides are mainly influenced by the transverse width of the central region. Meanwhile, the current flowing over the T-stub ZGNR quantum waveguides gradually converges as the longitudinal length of the central region increases. We also find that a single edge-defect at certain positions of the central region may slightly suppress the transmission and reduce the current. Our findings provide a viable design option for adjusting current response in graphene-based quantum devices.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjb/s10051-022-00297-x.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022
