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扭曲的MoTe-MoSe异质双层中的混合莫尔激子和三重态激子

Hybrid Moiré Excitons and Trions in Twisted MoTe-MoSe Heterobilayers.

作者信息

Zhao Shen, Huang Xin, Gillen Roland, Li Zhijie, Liu Song, Watanabe Kenji, Taniguchi Takashi, Maultzsch Janina, Hone James, Högele Alexander, Baimuratov Anvar S

机构信息

Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany.

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences and School of Physical Sciences, CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100190, P. R. China.

出版信息

Nano Lett. 2024 Apr 10. doi: 10.1021/acs.nanolett.4c00541.

Abstract

We report experimental and theoretical studies of MoTe-MoSe heterobilayers with rigid moiré superlattices controlled by the twist angle. Using an effective continuum model that combines resonant interlayer electron tunneling with stacking-dependent moiré potentials, we identify the nature of moiré excitons and the dependence of their energies, oscillator strengths, and Landé -factors on the twist angle. Within the same framework, we interpret distinct signatures of bound complexes among electrons and moiré excitons in nearly collinear heterostacks. Our work provides a fundamental understanding of hybrid moiré excitons and trions in MoTe-MoSe heterobilayers and establishes the material system as a prime candidate for optical studies of correlated phenomena in moiré lattices.

摘要

我们报道了具有由扭转角控制的刚性莫尔超晶格的MoTe-MoSe异质双层的实验和理论研究。使用一个有效的连续介质模型,该模型将共振层间电子隧穿与依赖于堆叠的莫尔势相结合,我们确定了莫尔激子的性质以及它们的能量、振子强度和朗德因子对扭转角的依赖性。在同一框架内,我们解释了近共线异质结构中电子和莫尔激子之间束缚复合体的不同特征。我们的工作为MoTe-MoSe异质双层中的混合莫尔激子和三重子提供了基本理解,并将该材料系统确立为用于莫尔晶格中相关现象光学研究的主要候选材料。

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