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

Author

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  • Yuan-Chun Wang

    (Wenzhou University)

  • Yi-Jian Shi

    (Wenzhou University)

  • Peng-Jun Wang

    (Wenzhou University)

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

Suggested Citation

  • Yuan-Chun Wang & Yi-Jian Shi & Peng-Jun Wang, 2022. "Geometry dependent current–voltage characteristics of T-stub zigzag-edged graphene nanoribbon quantum waveguides," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 95(2), pages 1-9, February.
    • Handle: RePEc:spr:eurphb:v:95:y:2022:i:2:d:10.1140_epjb_s10051-022-00297-x
    DOI: 10.1140/epjb/s10051-022-00297-x
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