Electrically tunable topological transport of moiré polaritons  

摩尔超晶格中电场可调的极化激元拓扑输运

作　　者：Hongyi Yu Wang Yao 俞弘毅;姚望(Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,China;Department of Physics,The University of Hong Kong,Hong Kong,China;HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong,Hong Kong,China)

机构地区：[1]Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,China [2]Department of Physics,The University of Hong Kong,Hong Kong,China [3]HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong,Hong Kong,China

出　　处：《Science Bulletin》2020年第18期1555-1562,M0004,共9页科学通报（英文版）

基　　金：the Key-Area Research and Development Program of Guangdong Province(2019B030330001);Research Grants Council of Hong Kong(17312916);Seed Funding for Strategic Interdisciplinary Research Scheme of HKU。

摘　　要：Moiré interlayer exciton in transition metal dichalcogenide heterobilayer features a permanent electric dipole that enables the electrostatic control of its flow, and optical dipole that is spatially varying in the moiré landscape. We show the hybridization of moiré interlayer exciton with photons in a planar 2D cavity leads to two types of moiré polaritons that exhibit distinct forms of topological transport phenomena including the spin/valley Hall and polarization Hall effects, which feature remarkable electrical tunability through the control of exciton-cavity detuning by the interlayer bias.在由不同的单层过渡金属硫族化合物堆叠形成的双层范德瓦尔斯异质结中,两层之间的微小转角可导致摩尔超晶格的出现,其基态光学性质由位于不同层的电子和空穴通过库仑吸引形成的层间激子主导.层间激子携带的静电偶极矩使得它可以通过静电势来操控其定向流动,同时层间激子也具有一定的光学跃迁偶极矩,它的大小和方向随层间激子在摩尔超晶格中的位置而变化.本文指出摩尔超晶格中的层间激子与二维平面光学微腔内光子模的杂化可产生两种具备不同拓扑性质的摩尔极化激元,可导致自旋/谷霍尔效应和偏振霍尔效应.通过调节两层间的电压改变层间激子与光学腔内光子模的失谐量,可选择特定种类的摩尔极化激元,这使得它的拓扑输运现象具备卓越的电场可调性.

关 键 词：Valleytronics Transition metal dichalcogenides Moirépattern Exciton polariton Anomalous Hall effect 

分 类 号：O469[理学—凝聚态物理]