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

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 1G(0) conductance for the ribbons of MoS2 and WS2; 2G(0) conductance for MoS2, WS2, WSe2 wires, and ribbons of MoTe2 and WTe2; and 3G(0) 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 5 eV 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. (C) 2013 Elsevier B.V. All rights reserved.