A valley valve and electron beam splitter.

Li, Jing; Zhang, Rui-Xing; Yin, Zhenxi; Zhang, Jianxiao; Watanabe, Kenji; Taniguchi, Takashi; Liu, Chaoxing; Zhu, Jun · Science · 2018

basic_science · Level V

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Abstract

Developing alternative paradigms of electronics beyond silicon technology requires the exploration of fundamentally new physical mechanisms, such as the valley-specific phenomena in hexagonal two-dimensional materials. We realize ballistic valley Hall kink states in bilayer graphene and demonstrate gate-controlled current transmission in a four-kink router device. The operations of a waveguide, a valve, and a tunable electron beam splitter are demonstrated. The valley valve exploits the valley-momentum locking of the kink states and reaches an on/off ratio of 8 at zero magnetic field. A magnetic field enables a full-range tunable coherent beam splitter. These results pave a path to building a scalable, coherent quantum transportation network based on the kink states.