Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session GG03: V: Cooperative Phenomena, Magnetic Domains, and Domain Walls
12:30 PM–2:30 PM,
Monday, March 20, 2023
Room: Virtual Room 3
Sponsoring
Unit:
GMAG
Chair: Jie Ma, Shanghai Jiao Tong Univ
Abstract: GG03.00006 : Twisted Magnon Frequency Comb and Penrose Superradiance*
1:30 PM–1:42 PM
Presenter:
Peng Yan
(University of Electronic Science and Technology of China)
Authors:
Peng Yan
(University of Electronic Science and Technology of China)
Zhenyu Wang
(University of Electronic Science and Technology of China)
Huaiyang Yuan
(Utrecht University)
Yunshan Cao
(University of Electronic Science and Technology of China)
We show that the circular geometry twists the spin-wave fields with spiral phase dislocations carrying
quantized orbital angular momentum (OAM). Meanwhile, the confluence and splitting scattering of twisted
magnons off the gyrating vortex core (VC) generates a frequency comb consisting of discrete and equally
spaced spectral lines, dubbed as twisted magnon frequency comb (TMFC). It is found that the mode
spacing of the TMFC is equal to the gyration frequency of the VC and the OAMquantum numbers between
adjacent spectral lines differ by one. By applying a magnetic field perpendicular to the plane of a thick
nanodisk, we observe a magnonic Penrose superradiance inside the cone vortex state, which mimics the
amplification of particles scattered from a rotating black hole. It is demonstrated that the higher-order
modes of TMFC are significantly amplified while the lower-order ones are trapped within the VC gyrating
orbit which manifests as the ergoregion. These results suggest a promising way to generate twisted
magnons with large OAM and to drastically improve the flatness of the magnon comb.
*National Natural Science Foundation of China (GrantsNo. 12074057, No. 11604041, and No. 11704060).
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