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arXiv 2302.01719cond-mat.mtrl-scicond-mat.mes-hall
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基于含时GW方法的MoS $_2$时间分辨光电子能谱中的巨自激激子-Floquet特征

Giant self-driven exciton-Floquet signatures in time-resolved photoemission spectroscopy of MoS$_2$ from time-dependent GW approach

Y. -H. Chan, Diana Y. Qiu, Felipe H. da Jornada, Steven G. Louie

摘要:

时间分辨角分辨光电子能谱(TR-ARPES)是一种单粒子光谱技术,可以探测动量空间中的激子(两粒子激发)。我们提出了一个从头算,时域GW方法TR-ARPES和单层MOS $_2$。我们发现,光激发激子可以测量和量化的卫星带,以及导致重整化的准粒子带。这些功能解释的激子Floquet现象引起的激子随时间变化的玻色子场,这是数量级强于激光场诱导的Floquet带在低维半导体。我们的发现为理解光场驱动材料的行为打开了一扇大门。

英文摘要:

Time-resolved, angle-resolved photoemission spectroscopy (TR-ARPES) is a one-particle spectroscopic technique that can probe excitons (two-particle excitations) in momentum space. We present an ab initio, time-domain GW approach to TR-ARPES and apply it to monolayer MoS$_2$. We show that photoexcited excitons may be measured and quantified as satellite bands, as well as leading to the renormalization of the quasiparticle bands. These features are explained in terms of an exciton- Floquet phenomenon induced by an exciton time-dependent bosonic field, which is orders of magnitude stronger than laser field induced Floquet bands in low-dimensional semiconductors. Our findings open a door to understanding the behavior of optical-field driven materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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