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arXiv 1803.04400cond-mat.mes-hall
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微角扭曲双层石墨烯中电调谐规范场

Electrically tunable gauge fields in tiny-angle twisted bilayer graphene

A. Ramires, J. L. Lado

摘要:

扭曲双层石墨烯由于其丰富的电子性质和可调谐性,近年来引起了人们的广泛关注。在这里,我们表明,对于非常小的扭转角,$α\ll 1^\circ$,垂直电场的应用在数学上等价于一种新的人工规范场。这种识别为在稳健的设置中生成和检测石墨烯平台中的伪朗道能级打开了大门,这些设置不依赖于应变工程,因此可以实际地收获用于技术应用。此外,这种新的人工规范场导致高度本地化模式的发展与平带接近电荷中性,形成一个紧急的Kagome晶格在真实空间中。我们的研究结果表明,对于微小的角度,偏置扭曲双层石墨烯是一个很有前途的平台,可以实现高度局域态的阻挫晶格,开辟了一个新的方向,强关联相的物质的研究。

英文摘要:

Twisted bilayer graphene has recently attracted a lot of attention for its rich electronic properties and tunability. Here we show that for very small twist angles, $α\ll 1^\circ$, the application of a perpendicular electric field is mathematically equivalent to a new kind of artificial gauge field. This identification opens the door for the generation and detection of pseudo-Landau levels in graphene platforms within robust setups which do not depend on strain engineering and therefore can be realistically harvested for technological applications. Furthermore, this new artificial gauge field leads to the development of highly localized modes associated with flat bands close to charge neutrality which form an emergent Kagome lattice in real space. Our findings indicate that for tiny angles, biased twisted bilayer graphene is a promising platform which can realize frustrated lattices of highly localized states, opening a new direction for the investigation of strongly correlated phases of matter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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