Femtosecond exciton dynamics in WSe2 optical waveguides.

Nature Communications
Aaron J SternbachD N Basov

Abstract

Van-der Waals (vdW) atomically layered crystals can act as optical waveguides over a broad range of the electromagnetic spectrum ranging from Terahertz to visible. Unlike common Si-based waveguides, vdW semiconductors host strong excitonic resonances that may be controlled using non-thermal stimuli including electrostatic gating and photoexcitation. Here, we utilize waveguide modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe2, prompted by femtosecond light pulses. Using time-resolved scanning near-field optical microscopy we visualize the electric field profiles of waveguide modes in real space and time and extract the temporal evolution of the optical constants following femtosecond photoexcitation. By monitoring the phase velocity of the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark shift in WSe2.

References

Dec 17, 2014·Nature Materials·Edbert J SieNuh Gedik
Oct 3, 2015·Physical Review Letters·Alexey ChernikovTony F Heinz
Apr 21, 2016·Nano Letters·Sven Alexander DöngesMarkus B Raschke
Aug 27, 2016·Physical Review Letters·Zhiyuan SunM M Fogler
Oct 11, 2016·Nature Communications·Martin ClaassenThomas P Devereaux
Oct 16, 2016·Science·D N BasovF J García de Abajo
Nov 29, 2016·Nature Materials·Tony LowFrank Koppens
Dec 13, 2016·Nature Nanotechnology·Markus A HuberRupert Huber
Aug 11, 2018·Nano Letters·Archana RajaAlexey Chernikov
Aug 31, 2018·Nano Letters·Biswanath ChakrabortyVinod M Menon
Feb 13, 2019·Science Advances·M MrejenH Suchowski
May 11, 2019·Advanced Materials·Debo HuQing Dai
Jan 10, 2020·Nature Physics·J W McIverA Cavalleri

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Citations

Dec 4, 2020·Advanced Materials·Thales V A G de OliveiraLukas M Eng
May 15, 2021·Advanced Materials·Wei LiuQihuang Gong
Jul 27, 2021·ACS Nano·Surendra B AnantharamanDeep Jariwala
Sep 17, 2020·Nano Letters·Francesco L RutaDimitri N Basov
Aug 17, 2021··Raphael DahanMathieu Kociak

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