Predicting ultrafast Dirac transport channel at the one-dimensional interface of the two-dimensional coplanar ZnO/MoS2 heterostructure

Article

关键词: HEXAGONAL BORON-NITRIDE;    EPITAXIAL-GROWTH;    FERMI VELOCITY;    ELECTRON-GAS;    GRAPHENE;    MOS2;    TRANSITION;    HETEROJUNCTION;    POLARIZATION;    ENHANCEMENT;   

DOI  :  10.1103/PhysRevB.99.035424

来源: SCIE

【 摘 要 】

The discovery of high-mobility electron gas at the two-dimensional (2D) LaAlO3/SrTiO3 heterointerface [A. Ohtomo and H. Hwang, Nature (London) 427, 423 (2004)] has attracted great research interest due to the ballistic transport of spatially confined electrons. When such kind of valence discontinuity extends to the interface of a well-chosen in-planar 2D heterostructure, a one-dimensional (1D) confined interface can be generated. Herein, through first-principles modeling, we demonstrate that Dirac-cone-like bands emerge at the 1D zigzag interface of a ZnO/MoS2 lateral heterostructure (LHS), creating a highly mobile 1D transport channel with a high Fermi velocity of 4.5 x 10(5) m/s. The metallic state at the 1D heterointerface is attributed to the polar discontinuity that introduces excess charge carriers. Nontrivial polarization (excess carriers appear at boundaries) results in a large built-in electric field within the ZnO and MoS2 monolayers. Remarkably, the ultrafast 1D conducting channel is independent of the arrangements of width (m and n) in the (ZnO)(m)(MoS2), LHS, which are further illustrated by tight-binding-based orbital and polarization analysis.

【 授权许可】

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