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arXiv · 2409.18501

Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet

Biswajit Datta·Pratap Chandra Adak·Sichao Yu·Agneya V. Dharmapalan·Siedah J. Hall·Anton Vakulenko·Filipp Komissarenko·Egor Kurganov·Jiamin Quan·Wei Wang·Kseniia Mosina·Zdeněk Sofer·Dimitar Pashov·Mark van Schilfgaarde·Swagata Acharya·Akashdeep Kamra·Matthew Y. Sfeir·Andrea Alù·Alexander B. Khanikaev·Vinod M. Menon
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Abstract

Excitons are fundamental excitations that govern the optical properties of semiconductors. Interacting excitons can lead to various emergent phases of matter and large nonlinear optical responses. In most semiconductors, excitons interact via exchange interaction or phase space filling. Correlated materials that host excitons coupled to other degrees of freedom offer hitherto unexplored pathways for controlling these interactions. Here, we demonstrate magnon-mediated excitonic interactions in CrSBr, an antiferromagnetic semiconductor. This interaction manifests as the dependence of exciton energy on exciton density via a magnonic adjustment of the spin canting angle. Our study demonstrates the emergence of quasiparticle-mediated interactions in correlated quantum materials, leading to large nonlinear optical responses and potential device concepts such as magnon-mediated quantum transducers.

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Biswajit Datta, Pratap Chandra Adak, Sichao Yu, Agneya V. Dharmapalan, Siedah J. Hall, Anton Vakulenko, Filipp Komissarenko, Egor Kurganov, Jiamin Quan, Wei Wang, Kseniia Mosina, Zdeněk Sofer, Dimitar Pashov, Mark van Schilfgaarde, Swagata Acharya, Akashdeep Kamra, Matthew Y. Sfeir, Andrea Alù, Alexander B. Khanikaev, Vinod M. Menon. 2024-09-27. Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet. https://doi.org/10.1038/s41563-025-02183-0

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