Interplay between topological valley and quantum Hall edge transport.
Interplay between topological valley and quantum Hall edge transport.
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拓扑谷与量子霍尔边输运之间的相互作用。
DOI：
10.1038/s41467-022-31680-y
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发表时间：
2022-07-20
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
在二维电子气体中实现拓扑保护状态的一种既定方法是通过施加垂直磁场从而创建量子霍尔边缘通道。有趣的是，在静电间隙双层石墨烯中，即使在没有磁场的情况下，拓扑保护的电子态也可以在自然发生的堆叠畴壁上出现。虽然单独研究了两种类型的拓扑保护状态，但它们有趣的相互作用仍然知之甚少。在这里，我们重点研究了高质量悬浮双层石墨烯的八倍简并零朗道能级的拓扑畴壁态与量子霍尔边缘输运之间的相互作用。我们发现，由于传导通道在畴壁和器件边缘之间交换，在整个不同量子霍尔态的低磁场中，双端电导保持近似恒定。然而，对于高磁场，我们在畴壁观察到输运抑制的证据，这可以归因于谱小隙的出现。这表明堆叠域壁可能不对应于顺序参数中的拓扑域壁。在静电间隙双层石墨烯中，即使在没有磁场的情况下，拓扑保护态也可以在自然发生的堆叠畴壁上出现。在这里，作者描述了在悬浮双层石墨烯的八倍简并零朗道能级内，这种畴壁态和量子霍尔边缘输运之间的相互作用。
An established way of realising topologically protected states in a two-dimensional electron gas is by applying a perpendicular magnetic field thus creating quantum Hall edge channels. In electrostatically gapped bilayer graphene intriguingly, even in the absence of a magnetic field, topologically protected electronic states can emerge at naturally occurring stacking domain walls. While individually both types of topologically protected states have been investigated, their intriguing interplay remains poorly understood. Here, we focus on the interplay between topological domain wall states and quantum Hall edge transport within the eight-fold degenerate zeroth Landau level of high-quality suspended bilayer graphene. We find that the two-terminal conductance remains approximately constant for low magnetic fields throughout the distinct quantum Hall states since the conduction channels are traded between domain wall and device edges. For high magnetic fields, however, we observe evidence of transport suppression at the domain wall, which can be attributed to the emergence of spectral minigaps. This indicates that stacking domain walls potentially do not correspond to a topological domain wall in the order parameter. In electrostatically-gapped bilayer graphene, topologically-protected states can emerge at naturally occurring stacking domain walls even in the absence of a magnetic field. Here, the authors describe the interplay between such domain wall states and quantum Hall edge transport within the eight-fold degenerate zeroth Landau level of suspended bilayer graphene.
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DOI：
10.1073/pnas.1309394110
发表时间：
2013-07-09
影响因子：
11.1
作者：
Alden, Jonathan S.;Tsen, Adam W.;McEuen, Paul L.
通讯作者：
McEuen, Paul L.
影响因子：
64.8
作者：
Ju, Long;Shi, Zhiwen;Wang, Feng
通讯作者：
Wang, Feng
影响因子：
3.7
作者：
Freitag, Frank;Weiss, Markus;Schoenenberger, Christian
通讯作者：
Schoenenberger, Christian
影响因子：
8.6
作者：
Kharitonov, Maxim
通讯作者：
Kharitonov, Maxim
影响因子：
56.9
作者：
Li, Jing;Zhang, Rui-Xing;Zhu, Jun
通讯作者：
Zhu, Jun