Geometry dependent current–voltage characteristics of T-stub zigzag-edged graphene nanoribbon quantum waveguides

Yuan-Chun Wang (), Yi-Jian Shi () and Peng-Jun Wang ()
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Yuan-Chun Wang: Wenzhou University
Yi-Jian Shi: Wenzhou University
Peng-Jun Wang: Wenzhou University

The European Physical Journal B: Condensed Matter and Complex Systems, 2022, vol. 95, issue 2, 1-9

Abstract: Abstract 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. Graphic Abstract

Date: 2022
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DOI: 10.1140/epjb/s10051-022-00297-x

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