Femtosecond exciton dynamics in WSe2 optical waveguides

Sternbach, A. J.; Latini, S.; Chae, S.; Hübener, H.; de Giovannini, U.; Shao, Y.; Xiong, L.; Sun, Z.; Shi, N.; Kissin, P.; Ni, G.-X.; Rhodes, D.; Kim, B.; Yu, N.; Millis, A. J.; Fogler, M. M.; Schuck, P. J.; Lipson, M.; Zhu, X.-Y.; Hone, J.; Averitt, R. D.; Rubio, A.; Basov, D. N.

doi:10.1038/s41467-020-17335-w

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Femtosecond exciton dynamics in WSe₂ optical waveguides

MPG-Autoren

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Latini, S.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Hübener, H.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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de Giovannini, U.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Rubio, A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Computational Quantum Physics (CCQ), Flatiron Institute;

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https://dx.doi.org/10.1038/s41467-020-17335-w
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Zitation

Sternbach, A. J., Latini, S., Chae, S., Hübener, H., de Giovannini, U., Shao, Y., et al. (2020). Femtosecond exciton dynamics in WSe₂ optical waveguides. Nature Communications, 11(1): 3567. doi:10.1038/s41467-020-17335-w.

Zitierlink: https://hdl.handle.net/21.11116/0000-0006-D010-C

Zusammenfassung

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.