تقرير
On orbital angular momentum conservation in Brillouin light scattering within a ferromagnetic sphere
| العنوان: | On orbital angular momentum conservation in Brillouin light scattering within a ferromagnetic sphere |
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| المؤلفون: | Osada, A., Gloppe, A., Nakamura, Y., Usami, K. |
| سنة النشر: | 2017 |
| المجموعة: | Condensed Matter Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics |
| الوصف: | Magnetostatic modes supported by a ferromagnetic sphere have been known as the Walker modes, each of which possesses an orbital angular momentum as well as a spin angular momentum along a static magnetic field. The Walker modes with non-zero orbital angular momenta exhibit topologically non-trivial spin textures, which we call \textit{magnetic quasi-vortices}. Photons in optical whispering gallery modes supported by a dielectric sphere possess orbital and spin angular momenta forming \textit{optical vortices}. Within a ferromagnetic, as well as dielectric, sphere, two forms of vortices interact in the process of Brillouin light scattering. We argue that in the scattering there is a selection rule that dictates the exchange of orbital angular momenta between the vortices. The selection rule is shown to be responsible for the experimentally observed nonreciprocal Brillouin light scattering. Comment: 7 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1367-2630/aae4b1 |
| URL الوصول: | http://arxiv.org/abs/1711.09321 |
| رقم الأكسشن: | edsarx.1711.09321 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1367-2630/aae4b1 |
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