双层石墨烯
石墨烯
异质结
凝聚态物理
Dirac(视频压缩格式)
对偶(语法数字)
双层
量子
物理
材料科学
量子力学
膜
化学
艺术
生物化学
文学类
中微子
作者
Takuya Iwasaki,Yoshifumi Morita,Kenji Watanabe,Takashi Taniguchi
出处
期刊:Physical review
日期:2024-02-08
卷期号:109 (7)
标识
DOI:10.1103/physrevb.109.075409
摘要
In gapped Dirac materials, the topological current associated with each valley can flow in opposite directions creating long-range charge-neutral valley currents. We report valley currents in hexagonal boron nitride (hBN)/bilayer-graphene heterostructures with an energy gap, which is tunable by a perpendicular electric (displacement) field in a dual-gated structure. We observed significant nonlocal resistance, consistent with the scaling theory of the valley Hall effect. In the low-temperature limit, the nonlocal resistance approaches a saturated value near the ``quantum limit,'' indicating the emergence of quantum valley currents.
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