Conductance of L-shaped and T-shaped graphene nanoribbons. (February 2018)

• Record Type: Journal Article
• Authors: Moysidis, Savvas; Karafyllidis, Ioannis G.
• Is Part Of: Microelectronics journal. Volume 72(2018)
• Page Start: 11
• Page End: 13
• Publication Date: 2018-02
• Subjects: Nanoelectronics -- Graphene -- Carbon-based electronics; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2017.12.003
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: Rectangular graphene nanoribbons with two contacts have been studied extensively as parts of several nanoelectronic devices. L-shaped and T-shaped graphene nanoribbons received a little or no attention until now. In this letter, we present computations of the conductance of L-shaped graphene nanoribbons with two contacts and of T-shaped graphene nanoribbons with tree contacts. We used tight-binding Hamiltonians and non-equilibrium Green's functions to compute their conductance. In L and T-shaped nanoribbons electrons are initially transported along a zigzag-edged nanoribbon, and then the direction of their motion changes by 90 O and are transported along an armchair-edged nanoribbon. Our results show that this change in direction of motion results in a zero-conductance region that extents about 0.25 eV below and above the Fermi level. This zero conductance region is large enough to cause current switching and, because of this, L and T-shaped graphene nanoribbons can be used as building blocks for logic gates.