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Binary Two-Dimensional Honeycomb Lattice with Strong Spin-Orbit Coupling and Electron-Hole Asymmetry
Physical Review Letters ( IF 8.6 ) Pub Date : 2018-09-17 , DOI: 10.1103/physrevlett.121.126801
Jian Gou , Bingyu Xia , Hang Li , Xuguang Wang , Longjuan Kong , Peng Cheng , Hui Li , Weifeng Zhang , Tian Qian , Hong Ding , Yong Xu , Wenhui Duan , Kehui Wu , Lan Chen

Two-dimensional (2D) materials consisting of heavy atoms with particular arrangements may host exotic quantum properties. Here, we report a unique 2D semiconducting binary compound, a Sn2Bi atomic layer on Si(111), in which hexagons are formed by bonding Bi with a triangular network of Sn. Because of the unique honeycomb configuration, the heavy elements, and the energy-dependent hybridization between Sn and Bi, 2D Sn2Bi not only shows strong spin-orbit coupling effects but also exhibits high electron-hole asymmetry: Nearly free hole bands and dispersionless flat electron bands coexist in the same system. By tuning the Fermi level, it is possible to preserve both nearly free and strongly localized charge carriers in the same 2D material, which provides an ideal platform for the studies of strongly correlated phenomena and possible applications in nanodevices.

中文翻译:

具有强自旋轨道耦合和电子-孔不对称性的二维二维蜂窝格

由具有特定排列的重原子组成的二维(2D)材料可能具有奇异的量子特性。在这里,我们报告了一种独特的2D半导体二元化合物2个Si(111)上的一个原子层,其中通过将Bi与Sn的三角形网络结合而形成六边形。由于独特的蜂窝结构,较重的元素以及Sn和Bi之间的能量依赖性杂交,二维2个不仅表现出很强的自旋轨道耦合效应,而且表现出很高的电子-空穴不对称性:几乎自由的空穴能带和无分散的平坦电子能带共存于同一系统中。通过调节费米能级,可以在同一2D材料中保留几乎自由的电荷和强定位的电荷载流子,这为研究强相关现象和在纳米器件中的可能应用提供了理想的平台。
更新日期:2018-09-18
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