Ultrafast pseudomagnetic fields from electron-nuclear quantum geometry
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916554244882432 |
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| author | Klebl, Lennart Schobert, Arne Eckstein, Martin Sangiovanni, Giorgio Balatsky, Alexander V. Wehling, Tim O. |
| author_facet | Klebl, Lennart Schobert, Arne Eckstein, Martin Sangiovanni, Giorgio Balatsky, Alexander V. Wehling, Tim O. |
| contents | Recent experiments demonstrate precise control over coherently excited circular phonon modes using high-intensity terahertz lasers, opening new pathways towards dynamical, ultrafast design of magnetism in functional materials. While the phonon Zeeman effect enables a theoretical description of phonon-induced magnetism, it lacks efficient angular momentum transfer from the phonon to the electron sector. In this work, we put forward a coupling mechanism based on electron-nuclear quantum geometry, with the inverse Faraday effect as a limiting case. This effect is rooted in the phase accumulation of the electronic wavefunction under a circular evolution of nuclear coordinates. An excitation pulse then induces a transient level splitting between electronic orbitals that carry angular momentum. First-principle simulations on SrTiO$_3$ demonstrate that in parts of the Brillouin zone, this splitting between orbitals carrying angular momentum can easily reach 50 meV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_13070 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast pseudomagnetic fields from electron-nuclear quantum geometry Klebl, Lennart Schobert, Arne Eckstein, Martin Sangiovanni, Giorgio Balatsky, Alexander V. Wehling, Tim O. Materials Science Mesoscale and Nanoscale Physics Recent experiments demonstrate precise control over coherently excited circular phonon modes using high-intensity terahertz lasers, opening new pathways towards dynamical, ultrafast design of magnetism in functional materials. While the phonon Zeeman effect enables a theoretical description of phonon-induced magnetism, it lacks efficient angular momentum transfer from the phonon to the electron sector. In this work, we put forward a coupling mechanism based on electron-nuclear quantum geometry, with the inverse Faraday effect as a limiting case. This effect is rooted in the phase accumulation of the electronic wavefunction under a circular evolution of nuclear coordinates. An excitation pulse then induces a transient level splitting between electronic orbitals that carry angular momentum. First-principle simulations on SrTiO$_3$ demonstrate that in parts of the Brillouin zone, this splitting between orbitals carrying angular momentum can easily reach 50 meV. |
| title | Ultrafast pseudomagnetic fields from electron-nuclear quantum geometry |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.13070 |