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PT-Symmetric Magnon Lasing and Antilasing
Xi-Guang Wang1, Tian-Xiang Lu2, Guang-Hua Guo1
1Central South University, School of Physics, Changsha 410083, China.
Physical Review Letters
|July 26, 2026
Summary
Researchers developed a novel device for tunable magnonic lasing and antilasing using PT-symmetric gain-loss. This platform enables a single element to function as both a magnon laser and absorber, advancing non-Hermitian magnonics.
Area of Science:
- Condensed matter physics
- Quantum optics
- Spintronics
Background:
- PT-symmetric systems offer unique control over light and magnons.
- Magnonic devices are promising for information processing.
- Achieving single-mode operation in magnonic devices is challenging.
Purpose of the Study:
- To propose and demonstrate a mechanism for electrically tunable PT-symmetric magnonic lasing and antilasing.
- To develop a device capable of simultaneous lasing and absorption of magnons.
- To explore reconfigurable non-Hermitian magnonics and integrated magnon signal processing.
Main Methods:
- Device fabrication: current-biased planar waveguide with attached heavy-metal wires.
- Mechanism: spatially periodic spin-orbit torques inducing modulated magnon gain and loss.
- Validation: analytical modeling and numerical simulations.
Main Results:
- Demonstrated single-frequency magnon mode emission (lasing) and absorption (antilasing) at the Bragg point.
- PT-symmetric gain-loss balance stabilizes single-mode operation, overcoming nonlinear dispersion challenges.
- Electrically tunable operation shown in ring geometries and for antiferromagnetic ordering.
Conclusions:
- Established an experimentally realistic platform for a dual-function magnon laser-absorber.
- Opened opportunities for reconfigurable non-Hermitian magnonics.
- Paved the way for integrated magnon signal processing applications.
