Excitons In Twisted Van Der Waals Bilayers: Internal Structure And Ultrafast Dynamics

Fabian Mooshammer,Philipp Merkl,Simon Ovesen,Samuel Brem,Anna Girnghuber,Kai-Qiang Lin,Marlene Liebich,Chaw-Keong Yong,Rolang Gillen,Janina Maultzsch,John M. Lupton,Ermin Malic,Rupert Huber

2020 45TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)（2020）

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摘要

By probing internal 1s-2p transitions with phaselocked mid-infrared pulses, we reveal the internal structure and binding energy of photo-generated excitons in transition metal dichalcogenide bilayers. Furthermore, we trace how the twist angle precisely controls the ultrafast formation of interlayer excitons and tunes excitonic hybridization in hetero- and homobilayers, respectively.

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关键词

interlayer excitons,twisted van der Waals bilayers,internal structure,binding energy,photogenerated excitons,transition metal dichalcogenide bilayers,twist angle,phase-locked midinfrared pulses,excitonic hybridization,homobilayers,heterobilayers,WSe2

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