Bulk and edge properties of twisted double bilayer graphene
Bulk and edge properties of twisted double bilayer graphene
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扭曲双双层石墨烯的体积和边缘特性
DOI：
10.1038/s41567-021-01419-5
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发表时间：
2022
期刊：
影响因子：
19.6
通讯作者：
Tutuc, Emanuel
中科院分区：
文献类型：
--
作者：
Wang, Yimeng;Herzog-Arbeitman, Jonah;Burg, G. William;Zhu, Jihang;Watanabe, Kenji;Taniguchi, Takashi;MacDonald, Allan H.;Bernevig, B. Andrei;Tutuc, Emanuel
受控二维莫尔材料的出现，，，，，——为研究拓扑物理提供了一个新的平台，——。当一半的平带被填充时，扭曲的双双层石墨烯预计将具有拓扑上非平凡的带隙相，其在电荷中性时陈数等于二。然而，使用单次测量来诊断拓扑状态可能很困难，因为同时探测体和边缘属性是理想的。在这里，我们报告了化学势测量、输运测量和理论计算的组合，表明扭曲双层石墨烯除了同时在整体上绝缘之外，还可以承载金属边缘输运。对多端样品测量的 Landauer-Büttiker 分析使我们能够定量评估边缘态散射。我们将这些结果解释为电荷中性时预测的拓扑相的特征，但需要确定边缘传输的进一步表征。
The emergence of controlled, two-dimensional moiré materials, , , , –has uncovered a new platform for investigating topological physics, –. Twisted double bilayer graphene has been predicted to host a topologically non-trivial gapped phase with Chern number equal to two at charge neutrality, when half the flat bands are filled,. However, it can be difficult to diagnose topological states using a single measurement because it is ideal to probe the bulk and edge properties at the same time. Here we report a combination of chemical potential measurements, transport measurements and theoretical calculations that show that twisted double bilayer graphene can host metallic edge transport in addition to simultaneously being insulating in the bulk. A Landauer–Büttiker analysis of the measurements on multi-terminal samples allows us to quantitatively assess the edge-state scattering. We interpret these results as signatures of the predicted topological phase at charge neutrality, but further characterization of the edge transport is required to be certain.
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影响因子：
64.8
作者：
Park, Jeong Min;Cao, Yuan;Jarillo-Herrero, Pablo
通讯作者：
Jarillo-Herrero, Pablo
双层石墨烯量子点的能级
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
D. R. Costa;M. Zarenia;A. Chaves;G. A. Farias;F. Peeters
通讯作者：
F. Peeters
影响因子：
41.2
作者：
Wu, Shuang;Zhang, Zhenyuan;Andrei, Eva Y.
通讯作者：
Andrei, Eva Y.
影响因子：
64.8
作者：
Cao, Yuan;Rodan-Legrain, Daniel;Jarillo-Herrero, Pablo
通讯作者：
Jarillo-Herrero, Pablo