Magnons at low excitations: Observation of incoherent coupling to a bath of two-level systems

作者：Marco Pfirrmann, Isabella Boventer, Andre Schneider, Tim Wolz, Mathias Kläui, Alexey Vladimirovich Ustinov, Martin P. Weides · 发表于：Physical Review Research · 年份：2019 · DOI：10.1103/physrevresearch.1.032023 · 被引用次数：32 · 研究领域：Mechanical and Optical Resonators、Quantum Information and Cryptography、Quantum and electron transport phenomena

Incoherent coupling to a bath of two-level systems is the dominating loss mechanism in magnons at quantum excitations. The authors study a hybrid system of magnons and microwave cavity photons, where they demonstrate the power saturation of the two-level systems at low temperatures and map the linewidth in the frequency detuned case to the magnon excitation ratio in the hybrid system. This allows for the fundamental linewidth to be extracted without saturation effects by excess cavity photons.