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Title: Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets
Author(s): Yuan, Shaohua
Sui, Chaowei
Fan, Zhengduo
Berakdar, JamalLook up in the Integrated Authority File of the German National Library
Xue, DeshengLook up in the Integrated Authority File of the German National Library
Jia, Chenglong
Issue Date: 2023
Type: Article
Language: English
Abstract: Klein tunneling associated with particle-antiparticle pair productions across a potential barrier is a key prediction of quantum-field theory for relativistic particles. Yet, a direct experimental realization is hampered by the particles large rest mass resulting in high potential barrier. Here, for non-Hermitian antiferromagnets, at the verge of the anti-parity-time symmetry transition, chiral magnons are demonstrated to offer a bosonic platform to access Klein tunneling at meV energies in experimentally feasible settings. Our analytical and numerical simulations evidence that magnetic damping renders a low energy mechanism for the breakdown of the magnonic vacuum and for creating particle-antiparticle pairs in strong magnetic fields. Adopting Feynman’s picture for antiparticles, the tunneling time of an incident magnon wave packet across a supercritical barrier is found to be negative. The uncovered aspects point to the potential of chiral magnons for addressing fundamental physics in a conceptually simple setup with the potential for use in chirality-dependent magnonic computing.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Journal Title: Communications Physics
Publisher: Springer Nature
Publisher Place: London
Volume: 6
Original Publication: 10.1038/s42005-023-01222-z
Page Start: 1
Page End: 8
Appears in Collections:Open Access Publikationen der MLU

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