A valley valve and electron beam splitter
A valley valve and electron beam splitter
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DOI：
10.1126/science.aao5989
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发表时间：
2018-12-07
期刊：
影响因子：
56.9
通讯作者：
Zhu, Jun
中科院分区：
文献类型：
--
作者：
Li, Jing;Zhang, Rui-Xing;Zhu, Jun
开发硅技术以外的电子技术的替代范例需要探索全新的物理机制，例如六角形二维材料中特定于山谷的现象。我们在双层石墨烯中实现了弹道谷霍尔态，并在四结布线器中演示了栅控电流传输。演示了波导、阀和可调谐电子分束器的工作原理。谷阀利用了扭结态的谷动量锁定，在零磁场下达到了8的开关比。磁场可以实现全范围可调谐的相干分束器。这些结果为建立基于扭结态的可扩展、相干的量子传输网络铺平了道路。
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.