Microscopic Theory of Ultrafast Skyrmion Excitation by Light
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arXiv
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| Format: | Preprint |
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2020
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| author | Boström, Emil Viñas Rubio, Angel Verdozzi, Claudio |
| author_facet | Boström, Emil Viñas Rubio, Angel Verdozzi, Claudio |
| contents | We propose a microscopic mechanism for ultrafast skyrmion photo-excitation via a two-orbital electronic model. In the strong correlation limit the $d$-electrons are described by an effective spin Hamiltonian, coupled to itinerant $s$-electrons via $s-d$ exchange. Laser-exciting the system by a direct coupling to the electric charge leads to skyrmion nucleation on a 100 fs timescale. The coupling between photo-induced electronic currents and magnetic moments, mediated via Rashba spin-orbit interactions, is identified as the microscopic mechanism behind the ultrafast optical skyrmion excitation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2010_16125 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Microscopic Theory of Ultrafast Skyrmion Excitation by Light Boström, Emil Viñas Rubio, Angel Verdozzi, Claudio Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons We propose a microscopic mechanism for ultrafast skyrmion photo-excitation via a two-orbital electronic model. In the strong correlation limit the $d$-electrons are described by an effective spin Hamiltonian, coupled to itinerant $s$-electrons via $s-d$ exchange. Laser-exciting the system by a direct coupling to the electric charge leads to skyrmion nucleation on a 100 fs timescale. The coupling between photo-induced electronic currents and magnetic moments, mediated via Rashba spin-orbit interactions, is identified as the microscopic mechanism behind the ultrafast optical skyrmion excitation. |
| title | Microscopic Theory of Ultrafast Skyrmion Excitation by Light |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2010.16125 |