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arXiv · 2110.02633

Destructive photon echo formation in six-wave mixing signals of a MoSe$_2$ monolayer

Thilo Hahn·Diana Vaclavkova·Miroslav Bartos·Karol Nogajewski·Marek Potemski·Kenji Watanabe·Takashi Taniguchi·Paweł Machnikowski·Tilmann Kuhn·Jacek Kasprzak·Daniel Wigger
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Abstract

Monolayers of transition metal dichalcogenides display a strong excitonic optical response. Additionally encapsulating the monolayer with hexagonal boron nitride allows to reach the limit of a purely homogeneously broadened exciton system. On such a MoSe$_{2}$-based system we perform ultrafast six-wave mixing spectroscopy and find a novel destructive photon echo effect. This process manifests as a characteristic depression of the nonlinear signal dynamics when scanning the delay between the applied laser pulses. By theoretically describing the process within a local field model we reach an excellent agreement with the experiment. We develop an effective Bloch vector representation and thereby demonstrate that the destructive photon echo stems from a destructive interference of successive repetitions of the heterodyning experiment.

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Thilo Hahn, Diana Vaclavkova, Miroslav Bartos, Karol Nogajewski, Marek Potemski, Kenji Watanabe, Takashi Taniguchi, Paweł Machnikowski, Tilmann Kuhn, Jacek Kasprzak, Daniel Wigger. 2021-10-06. Destructive photon echo formation in six-wave mixing signals of a MoSe$_2$ monolayer. https://doi.org/10.1002/advs.202103813

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