Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets
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....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-05-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-023-01222-z |
| _version_ | 1797827527376371712 |
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| author | Shaohua Yuan Chaowei Sui Zhengduo Fan Jamal Berakdar Desheng Xue Chenglong Jia |
| author_facet | Shaohua Yuan Chaowei Sui Zhengduo Fan Jamal Berakdar Desheng Xue Chenglong Jia |
| author_sort | Shaohua Yuan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-09T12:49:45Z |
| format | Article |
| id | doaj.art-afadf9a7919a4e1f98284536e5000bad |
| institution | Directory Open Access Journal |
| issn | 2399-3650 |
| language | English |
| last_indexed | 2024-04-09T12:49:45Z |
| publishDate | 2023-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj.art-afadf9a7919a4e1f98284536e5000bad2023-05-14T11:19:15ZengNature PortfolioCommunications Physics2399-36502023-05-01611810.1038/s42005-023-01222-zMagnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnetsShaohua Yuan0Chaowei Sui1Zhengduo Fan2Jamal Berakdar3Desheng Xue4Chenglong Jia5Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou UniversityKey Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou UniversityKey Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou UniversityInstitut für Physik, Martin-Luther-Universität Halle-WittenbergKey Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou UniversityKey Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou UniversityAbstract 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.https://doi.org/10.1038/s42005-023-01222-z |
| spellingShingle | Shaohua Yuan Chaowei Sui Zhengduo Fan Jamal Berakdar Desheng Xue Chenglong Jia Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets Communications Physics |
| title | Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets |
| title_full | Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets |
| title_fullStr | Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets |
| title_full_unstemmed | Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets |
| title_short | Magnonic Klein and acausal tunneling enabled by breaking the anti parity-time symmetry in antiferromagnets |
| title_sort | magnonic klein and acausal tunneling enabled by breaking the anti parity time symmetry in antiferromagnets |
| url | https://doi.org/10.1038/s42005-023-01222-z |
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