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19 April 2024 |
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Article overview
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A valley valve and electron beam splitter in bilayer graphene | | Jing Li
; Rui-Xing Zhang
; Zhenxi Yin
; Jianxiao Zhang
; Kenji Watanabe
; Takashi Taniguchi
; Chaoxing Liu
; Jun Zhu
; | | Date: |
7 Aug 2017 | | Abstract: | To develop alternative paradigms of electronics beyond the performance and
application domains of silicon technology requires the exploration of
fundamentally new physical mechanisms. The valley degree of freedom inherent to
hexagonal two-dimensional materials offers a new route to this pursuit. In this
work, quantum valley Hall kink states with ballistic conductance of $4e^2/h$
are realized in bilayer graphene. We demonstrate valley-controlled current
transmission in a four-kink router device. The operations of a waveguide, a
valve and a tunable electron beam splitter are achieved. The on/off ratio of
the valley valve is 800%. The partition ratio of the electron beam splitter is
continuously tunable from 0 to 1, with quantized fractional ratios at 1/4, 1/2
and 3/4 observed in a strong magnetic field. An S-matrix model and
Landauer-B"uttiker transport formulism provide excellent description of data.
The demonstrated operations pave the path to a dissipationless quantum
transportation network based on kink states in bilayer graphene. | | Source: | arXiv, 1708.2311 | | Services: | Forum | Review | PDF | Favorites | |
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