Strong photon coupling to high-frequency antiferromagnetic magnons via topological surface states

• URL: http://arxiv.org/abs/2410.14780v1
• Date: Fri, 18 Oct 2024 18:00:08 GMT
• Title: Strong photon coupling to high-frequency antiferromagnetic magnons via topological surface states
• Authors: Henrik T. Kaarbø, Henning G. Hugdal, Sol H. Jacobsen,
• Abstract summary: We show strong coupling between antiferromagnetic magnons and microwave cavity photons at both high and externally controllable magnon frequencies. This result may advance the utilization of high-frequency cavity magn frequencies and enable its incorporation into quantum information technology.
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• Abstract: We show strong coupling between antiferromagnetic magnons and microwave cavity photons at both high and externally controllable magnon frequencies. Using the fully quantum mechanical path-integral method, we study an antiferromagnetic insulator (AFM) interfaced with a topological insulator (TI), taking Bi$_2$Se$_3$--MnSe as a representative example. We show that the mutual coupling of the spin-polarized surface states of the TI to both the squeezed magnons and the circularly polarized cavity photons results in a Chern-Simons term that activates the stronger electric, rather than magnetic, dipole coupling. Moreover, a squeezing-mediated enhancement of the coupling is achieved due to the unequal interfacial exchange coupling to the AFM sublattices, resulting in a coupling strength up to several orders stronger than for direct magnon-photon coupling. While direct cavity-AFM coupling has so far been limited in its applicability due to weak or low frequency coupling, this result may advance the utilization of high-frequency cavity magnonics and enable its incorporation into quantum information technology.

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