Layer-locked anomalous valley hall effect in two-dimensional tetragonal trilayers with electrically controllable valley and spin polarizations

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The river, which runs through seven US states that share it, is currently facing the worst drought in 1,200 years.

How could they work?

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3月24日,北京市少年宫,学生科技节创客集市上,多所学校展示学生研发的主题文创产品。新京报记者 李木易 摄