Magnon spin photogalvanic effect induced by Aharonov-Casher phase
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| Format: | Preprint |
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2023
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| _version_ | 1866911972609490944 |
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| author | Wang, YuanDong Zhu, Zhen-Gang Su, Gang |
| author_facet | Wang, YuanDong Zhu, Zhen-Gang Su, Gang |
| contents | Magnons are electrically neutral bosonic quasiparticles emerging as collective spin excitations of magnetically ordered materials, and play a central role in the next-generation spintronics owing to its obviating Joule heating. A difficult obstacle for quantum magnonics is that the magnons do not couple to the external electric field directly so that a direct electric manipulation via bias or gate voltage as in conventional charge-based devices seems not applicable. In this work, we propose a new mechanism in which magnons can be excited and controlled by electric field of light directly. Since the electric field of light can be tuned in a wide and easy way, the proposal is of great interest in realistic applications. We call it as the magnon spin photogalvanic effect (SPGE), which comes from five contributions: the Drude, Berry curvature dipole (BCD), injection, shift, and rectification, with distinct geometric origins. We further show that the responses to linearly-polarized or circularly-polarized light are determined by band-resolved quantum metric or Berry curvature, the two combined together just comprise of a quantum geometric tensor. The proposed magnon SPGE can be measured by a characterized topological phase transition. We also discuss a breathing kagome-lattice model of ferromagnets and suggest possible candidate materials to implement it. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2307_10882 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magnon spin photogalvanic effect induced by Aharonov-Casher phase Wang, YuanDong Zhu, Zhen-Gang Su, Gang Mesoscale and Nanoscale Physics Magnons are electrically neutral bosonic quasiparticles emerging as collective spin excitations of magnetically ordered materials, and play a central role in the next-generation spintronics owing to its obviating Joule heating. A difficult obstacle for quantum magnonics is that the magnons do not couple to the external electric field directly so that a direct electric manipulation via bias or gate voltage as in conventional charge-based devices seems not applicable. In this work, we propose a new mechanism in which magnons can be excited and controlled by electric field of light directly. Since the electric field of light can be tuned in a wide and easy way, the proposal is of great interest in realistic applications. We call it as the magnon spin photogalvanic effect (SPGE), which comes from five contributions: the Drude, Berry curvature dipole (BCD), injection, shift, and rectification, with distinct geometric origins. We further show that the responses to linearly-polarized or circularly-polarized light are determined by band-resolved quantum metric or Berry curvature, the two combined together just comprise of a quantum geometric tensor. The proposed magnon SPGE can be measured by a characterized topological phase transition. We also discuss a breathing kagome-lattice model of ferromagnets and suggest possible candidate materials to implement it. |
| title | Magnon spin photogalvanic effect induced by Aharonov-Casher phase |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2307.10882 |