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MON: Monday Contributed Sessions

MON 21: Quantum Materials

MON 21.3: Vortrag

Montag, 8. September 2025, 17:00–17:15, ZHG103

Strong Spin-Magnon coupling between paramagnetic ion GdW10 and VdW antiferromagnet CrSBr — •Jorge Perez-Bailon, David Garcia-Pons, Xavier del Arco-Fargas, David Zueco, and Maria Jose Martinez-Perez — Instituto de Nanociencia y Materiales de Aragón CSIC-Universidad de Zaragoza, Calle Pedro Cerbuna 12, 50009, Zaragoza, España

Cavity Quantum Electrodynamics (QED) has proven to be a highly powerful platform for manipulating and interrogating qubits. In these systems, strong coupling between qubits and quantized fields, typically photons, forms the basis for applications ranging from quantum sensing of individual spins to coherent qubit interactions. However, the reliance on photons in conventional electromagnetic cavities imposes intrinsic limitations on the maximum achievable coupling strengths and the accessible regimes of quantum physics.

Here we study the magnon-spin interaction between the layered van der Waals antiferromagnet CrSBr and the paramagnetic ion crystal GdW10 using microwave absorption spectroscopy at millikelvin temperatures. Analysis of macroscopic samples revealed multiple CrSBr resonances, attributed to phase differences among its layers, while an anticrossing at low power indicates strong coupling, which disappears at higher power as the paramagnet saturates. These findings suggest that CrSBr and similar materials could serve as magnonic platforms in hybrid quantum systems.

Keywords: spin-magnon interaction; strong coupling