Electronic transport and dielectric properties of low-dimensional structures of layered transition metal dichalcogenides

• Published in: Journal of alloys and compounds 2014-02, Vol.587, p.459-467
• Main Authors: Kumar, Ashok, Ahluwalia, P.K.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductance; Dielectric properties; Dielectric response; Electron energy loss spectra; Electronic band structure; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport; Electronic transport in multilayers, nanoscale materials and structures; Electronics; Exact sciences and technology; Molybdenum disulfide; Nanostructure; Nanowires; Physics; Ribbons; Tapes (metallic); Transition metal compounds
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.10.129

We present electronic transport and dielectric response of layered transition metal dichalcogenides nanowires and nanoribbons. Illustration 1: Conductance (G) and corresponding local density of states(LDOS) for LTMDs wires at applied bias. I–V characterstics are shown in lowermost panels. [Display omitted] •The studied configurations show metallic/semiconducting nature.•States around the Fermi energy are mainly contributed by the d orbitals of metal atoms.•The studied configurations show non-linear current–voltage (I–V) characteristics.•Additional plasmonic features at low energy have been observed for both wires and ribbons.•Dielectric functions for both wires and ribbons are anisotropic (isotropic) at low (high) energy range. We present first principle study of the electronic transport and dielectric properties of nanowires and nanoribbons of layered transition metal dichalcogenides (LTMDs), MX2 (M=Mo, W; X=S, Se, Te). The studied configuration shows metallic/semiconducting nature and the states around the Fermi energy are mainly contributed by the d orbitals of metal atoms. Zero-bias transmission show 1G0 conductance for the ribbons of MoS2 and WS2; 2G0 conductance for MoS2, WS2, WSe2 wires, and ribbons of MoTe2 and WTe2; and 3G0 conductance for WSe2 ribbon. The studied configurations show non-linear current–voltage (I–V) characteristics. Negative differential conductance (NDC) has also been observed for the nanoribbons of the selenides and tellurides of both Mo and W. Furthermore, additional plasmonic features below 5eV energy have been observed for both wires and ribbons as compared to the corresponding monolayers, which is found to be red-shifted on going from nanowires to nanoribbons.