Garcia-Ruiz Aitor, Liu Ming-Hao
Department of Physics and Center for Quantum Frontiers of Research and Technology (QFort), National Cheng Kung University, Tainan 70101, Taiwan.
Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.
Nano Lett. 2024 Dec 25;24(51):16317-16324. doi: 10.1021/acs.nanolett.4c04556. Epub 2024 Dec 11.
Gate voltages take full advantage of 2D systems, making it possible to explore novel states of matter by controlling their electron concentration or applying perpendicular electric fields. Here, we study the electronic properties of small-angle twisted bilayer MoS under a strong electric field. We show that transport across one of its constituent layers can be effectively regarded as a two-dimensional electron gas under a nanoscale potential. We find that the band structure of such a system is reconstructed following two fundamentally different symmetries depending on the orientation of the external electric field, namely, hexagonal or honeycomb. By studying this system under magnetic fields, we demonstrate that this duality not only translates into two different transport responses but also results in having two different Hofstadter's spectra. Our work opens up a new route for the creation of controllable artificial superlattices in van der Waals heterostructures.
栅极电压充分利用二维系统，通过控制电子浓度或施加垂直电场来探索新的物质状态成为可能。在此，我们研究了强电场下小角度扭曲双层二硫化钼的电子特性。我们表明，穿过其组成层之一的输运在纳米级电势下可有效地视为二维电子气。我们发现，根据外部电场的取向，即六边形或蜂窝状，该系统的能带结构会按照两种根本不同的对称性进行重构。通过在磁场下研究该系统，我们证明这种对偶性不仅转化为两种不同的输运响应，还导致具有两种不同的霍夫施塔特能谱。我们的工作为在范德华异质结构中创建可控人工超晶格开辟了一条新途径。
