Emergence of electron coherence and two-color all-optical switching in MoS2 based on spatial self-phase modulation

Proceedings of the National Academy of Sciences of the United States of America
Yanling WuJimin Zhao

Abstract

Generating electron coherence in quantum materials is essential in optimal control of many-body interactions and correlations. In a multidomain system this signifies nonlocal coherence and emergence of collective phenomena, particularly in layered 2D quantum materials possessing novel electronic structures and high carrier mobilities. Here we report nonlocal ac electron coherence induced in dispersed MoS2 flake domains, using coherent spatial self-phase modulation (SSPM). The gap-dependent nonlinear dielectric susceptibility χ(3) measured is surprisingly large, where direct interband transition and two-photon SSPM are responsible for excitations above and below the bandgap, respectively. A wind-chime model is proposed to account for the emergence of the ac electron coherence. Furthermore, all-optical switching is achieved based on SSPM, especially with two-color intraband coherence, demonstrating that electron coherence generation is a ubiquitous property of layered quantum materials.

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Citations

Feb 22, 2017·Advanced Materials·Shaoliang YuLimin Tong
Nov 16, 2017·Scientific Reports·Lili HuXinghua Lu
Apr 16, 2016·Optics Letters·Jingdi ZhangJun He
Feb 8, 2019·Advanced Materials·Leiming WuHan Zhang
Nov 12, 2020·Applied Optics·Xiangpeng YangXiangshen Meng

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