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arXiv · 2611.08873

Rotational Doppler Effect and Helimagnon Frequency Comb in Sliding Magnetic Spirals

Yang Liu·Jie Liu·Tianci Gong·Zhaozhuo Zeng·Xiaoping Gao·Kai Chang·Peng Yan
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Abstract

Collective spin motion can reshape magnon spectra by providing a dynamical magnetic background. Magnetic spirals offer a particularly clean setting, as they simultaneously host propagating helimagnons and a gapless Goldstone mode, i.e., the sliding of the spiral. Here, we show that once a helimagnon is excited and the spiral slides, the motion, which rotates the local spin frame, produces a thresholdless rotational Doppler shift of the helimagnon spectrum, with even winding for the linear mode and odd winding for its second harmonic. Stronger excitation generates one finite-momentum phason. Mixing of that phason with the helimagnon produces a helimagnon frequency comb only inside a finite driving window, spaced by the phason frequency fixed by the spiral length rather than by the sliding rate. These two scales are separable in a microwave experiment: the Doppler offset tracks the sliding velocity, whereas the comb spacing scales inversely with the length of the spiral.

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Yang Liu, Jie Liu, Tianci Gong, Zhaozhuo Zeng, Xiaoping Gao, Kai Chang, Peng Yan. 2026-11-06. Rotational Doppler Effect and Helimagnon Frequency Comb in Sliding Magnetic Spirals. https://arxiv.org/abs/2611.08873

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