研究目的
Investigating the experimental realization of anti-PT symmetry in a magnon-cavity-magnon coupled system and demonstrating the counterintuitive level-attraction process.
研究成果
The experiment successfully constructs anti-PT symmetry in a magnon-cavity-magnon coupled system without any gain medium, demonstrating the counterintuitive energy-attraction phenomenon. The magnon-readout method proves effective in exploring multimagnon-cavity coupled systems, paving the way for further studies on dynamical evolution and topological properties around exceptional points.
研究不足
The requirement of purely imaginary coupling constants between two bare states makes experimental realization of anti-PT symmetry challenging. The difference between dissipation rates and coupling rates of the magnons must be carefully controlled.
1：Experimental Design and Method Selection:
The experiment involves coupling two yttrium iron garnet (YIG) spheres to a microwave cavity to create a hybrid magnon-cavity system that obeys a two-dimensional anti-PT Hamiltonian.
2：Sample Selection and Data Sources:
Two YIG spheres of
3：3-mm diameter are placed inside a three-dimensional oxygen-free-copper cavity. List of Experimental Equipment and Materials:
YIG spheres, microwave cavity, loop readout antennae, high-precision room-temperature electromagnet.
4：Experimental Procedures and Operational Workflow:
The positions of the YIG spheres relative to the loop antennae are tuned, and the system is placed in a static magnetic bias field. The reflection parameters S11 and S22 are measured from antenna 1 and antenna 2, respectively.
5：Data Analysis Methods:
The experimental data are fitted with the calculated spectra using the original-experiment Hamiltonian and compared with the spectra predicted by the standard anti-PT Hamiltonian.
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