| Details: |
Two-dimensional semiconductors enable rich excitonic physics, as exemplified by 2D transition
metal dichalcogenides. Recently, the emergence of van der Waals magnetic semiconductors has
introduced a new dimension: the coexistence and interaction of excitons with coherent spin
excitations (magnons). In this talk, I will focus on the A-type antiferromagnet CrSBr, a material
that hosts a magnetically tunable excitonic spectrum and GHz-range magnetic resonances. I will
present experiments demonstrating that CrSBr can act as its own optical cavity, supporting self-
hybridized exciton-polaritons with highly anisotropic propagation linked to the underlying
magnetic order. I will then discuss how the coupling between magnons and excitons enables
magnon-mediated exciton–exciton interactions, providing a unique handle for tailoring optical
nonlinearities. Finally, I will show how these coherent interactions can be leveraged for
microwave-to-optical transduction, a critical step toward interfacing superconducting quantum
circuits with long-distance optical networks.
References:
1. P. C. Adak*, S. Yu, J. Abad-Arredondo*, *, B. Datta*, A. Cruz, K. Mosina, Z. Sofer, A. I. Fernández-
Domínguez, F. J. García-Vidal, V. M. Menon, Directional Flow of Confined Polaritons in CrSBr,
Advanced Materials, e12557 (2025).
2. B. Datta*, P. C. Adak*, S. Yu*, A. V. Dharmapalan, S. J. Hall, A. Vakulenko, F. Komissarenko, E.
Kurganov, J. Quan, W. Wang, K. Mosina, Z. Sofer, D. Pashov, M. v. Schilfgaarde, S. Acharya, A. Kamra,
M. Y. Sfeir, A. Alù, A. B. Khanikaev, V. M. Menon, Magnon-mediated exciton-exciton interaction in a
van der Waals antiferromagnet, Nature Materials 24, 1027 (2025). |