All optical excitation of spin polarization in d-wave altermagnets
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Weber, Marius Wust, Stephan Haag, Luca Akashdeep, Akashdeep Leckron, Kai Schmitt, Christin Ramos, Rafael Kikkawa, Takashi Saitoh, Eiji Kläui, Mathias Šmejkal, Libor Sinova, Jairo Aeschlimann, Martin Jakob, Gerhard Stadtmüller, Benjamin Schneider, Hans Christian |
| author_facet | Weber, Marius Wust, Stephan Haag, Luca Akashdeep, Akashdeep Leckron, Kai Schmitt, Christin Ramos, Rafael Kikkawa, Takashi Saitoh, Eiji Kläui, Mathias Šmejkal, Libor Sinova, Jairo Aeschlimann, Martin Jakob, Gerhard Stadtmüller, Benjamin Schneider, Hans Christian |
| contents | The recently discovered altermagnets exhibit collinear magnetic order with zero net magnetization but with unconventional spin-polarized d/g/i-wave band structures, expanding the known paradigms of ferromagnets and antiferromagnets. In addition to novel current-driven electronic transport effects, the unconventional time-reversal symmetry breaking in these systems also makes it possible to obtain a spin response to linearly polarized fields in the optical frequency domain. We show through ab-initio calculations of the prototypical d-wave altermagnet RuO$_2$, with $[C_2\|C_{4z}]$ symmetry combining twofold spin rotation with fourfold lattice rotation, that there is an optical analogue of a spin splitter effect, as the coupling to a linearly polarized exciting laser field makes the d-wave character of the altermagnet directly visible. By magneto-optical measurements on RuO$_2$ films of a few nanometer thickness, we demonstrate the predicted connection between the polarization of an ultrashort pump pulse and the sign and magnitude of a persistent optically excited electronic spin polarization. Our results point to the possibility of exciting and controlling the electronic spin polarization in altermagnets by such ultrashort optical pulses. In addition, the possibility of exciting an electronic spin polarization by linearly polarized optical fields in a compensated system is a unique consequence of the altermagnetic material properties, and our experimental results therefore present an indication for the existence of an altermagnetic phase in ultrathin RuO$_2$ films. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_05187 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | All optical excitation of spin polarization in d-wave altermagnets Weber, Marius Wust, Stephan Haag, Luca Akashdeep, Akashdeep Leckron, Kai Schmitt, Christin Ramos, Rafael Kikkawa, Takashi Saitoh, Eiji Kläui, Mathias Šmejkal, Libor Sinova, Jairo Aeschlimann, Martin Jakob, Gerhard Stadtmüller, Benjamin Schneider, Hans Christian Materials Science Mesoscale and Nanoscale Physics The recently discovered altermagnets exhibit collinear magnetic order with zero net magnetization but with unconventional spin-polarized d/g/i-wave band structures, expanding the known paradigms of ferromagnets and antiferromagnets. In addition to novel current-driven electronic transport effects, the unconventional time-reversal symmetry breaking in these systems also makes it possible to obtain a spin response to linearly polarized fields in the optical frequency domain. We show through ab-initio calculations of the prototypical d-wave altermagnet RuO$_2$, with $[C_2\|C_{4z}]$ symmetry combining twofold spin rotation with fourfold lattice rotation, that there is an optical analogue of a spin splitter effect, as the coupling to a linearly polarized exciting laser field makes the d-wave character of the altermagnet directly visible. By magneto-optical measurements on RuO$_2$ films of a few nanometer thickness, we demonstrate the predicted connection between the polarization of an ultrashort pump pulse and the sign and magnitude of a persistent optically excited electronic spin polarization. Our results point to the possibility of exciting and controlling the electronic spin polarization in altermagnets by such ultrashort optical pulses. In addition, the possibility of exciting an electronic spin polarization by linearly polarized optical fields in a compensated system is a unique consequence of the altermagnetic material properties, and our experimental results therefore present an indication for the existence of an altermagnetic phase in ultrathin RuO$_2$ films. |
| title | All optical excitation of spin polarization in d-wave altermagnets |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.05187 |