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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Tunneling Spectroscopy of Quantum Hall States in Bilayer Graphene
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APS -APS March Meeting 2017 - Event - Tunneling Spectroscopy of Quantum Hall States in Bilayer Graphene

机译：APS -APS 2017年3月会议-事件-双层石墨烯中量子霍尔态的隧穿光谱

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In the quantum Hall (QH) regime, ballistic conducting paths along the physical edges of a sample appear, leading to quantized Hall conductance and vanishing longitudinal magnetoconductance. These QH edge states are often described as ballistic compressible strips separated by insulating incompressible strips, the spatial profiles of which can be crucial in understanding the stability and emergence of interaction driven QH states. In this work, we present tunneling transport between two QH edge states in bilayer graphene. Employing locally gated device structure, we guide and control the separation between the QH edge states in bilayer graphene. Using resonant Landau level tunneling as a spectroscopy tool, we measure the energy gap in bilayer graphene as a function of displacement field and probe the emergence and evolution of incompressible strips.
机译：在量子霍尔（QH）体制中，沿着样品物理边缘的弹道传导路径出现，从而导致量化的霍尔电导和纵向磁导消失。这些QH边缘状态通常被描述为由绝缘不可压缩带隔开的弹道可压缩带，其空间轮廓对于理解相互作用驱动的QH状态的稳定性和出现至关重要。在这项工作中，我们介绍了双层石墨烯中两个QH边缘状态之间的隧穿传输。利用局部门控器件结构，我们指导和控制了双层石墨烯中QH边缘状态之间的分离。使用共振Landau能级隧穿作为光谱学工具，我们测量双层石墨烯中的能隙与位移场的关系，并探测不可压缩带的出现和演化。

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