A valley valve and electron beam splitter

Jing Li, Rui Xing Zhang, Zhenxi Yin, Jianxiao Zhang, Kenji Watanabe, Takashi Taniguchi, Chaoxing Liu, Jun Zhu

Research output: Contribution to journalArticle

18 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1149-1152
Number of pages4
JournalScience
Volume362
Issue number6419
DOIs
StatePublished - Dec 7 2018

All Science Journal Classification (ASJC) codes

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    Li, J., Zhang, R. X., Yin, Z., Zhang, J., Watanabe, K., Taniguchi, T., Liu, C., & Zhu, J. (2018). A valley valve and electron beam splitter. Science, 362(6419), 1149-1152. https://doi.org/10.1126/science.aao5989