Giant moment increase by ultrafast laser light
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916642537078784 |
|---|---|
| author | Sharma, Sangeeta Gill, Deepika Krishna, Jyoti Harris-Lee, Eddie Dewhurst, John Kay Shallcross, Sam |
| author_facet | Sharma, Sangeeta Gill, Deepika Krishna, Jyoti Harris-Lee, Eddie Dewhurst, John Kay Shallcross, Sam |
| contents | It is now well established that a few femtosecond laser pulse will induce an ultrafast loss of moment in a magnetic material. Here we show that the opposite effect can also occur: an ultrafast increase in moment. Employing both tight-binding and state-of-the-art time dependent density functional theory we find that laser light tuned to the majority spin conduction band in the 2d magnets CrI$_3$ and CrSBr generates an ultrafast giant moment increase, of up to 33\% in the case of CrI$_3$ (2~$μ_B$). Underpinning this is spin-orbit induced valence band spin texture that, in combination with a strong field light pulse, facilitates an optical spin flip transition involving both intra- and inter-band excitation. Our findings, that establish a general mechanism by which ultrafast light pulses may enhance as well as decrease the magnetic moment, point towards rich possibilities for light control over magnetic matter at femtosecond times. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_02396 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Giant moment increase by ultrafast laser light Sharma, Sangeeta Gill, Deepika Krishna, Jyoti Harris-Lee, Eddie Dewhurst, John Kay Shallcross, Sam Materials Science Other Condensed Matter Optics Quantum Physics It is now well established that a few femtosecond laser pulse will induce an ultrafast loss of moment in a magnetic material. Here we show that the opposite effect can also occur: an ultrafast increase in moment. Employing both tight-binding and state-of-the-art time dependent density functional theory we find that laser light tuned to the majority spin conduction band in the 2d magnets CrI$_3$ and CrSBr generates an ultrafast giant moment increase, of up to 33\% in the case of CrI$_3$ (2~$μ_B$). Underpinning this is spin-orbit induced valence band spin texture that, in combination with a strong field light pulse, facilitates an optical spin flip transition involving both intra- and inter-band excitation. Our findings, that establish a general mechanism by which ultrafast light pulses may enhance as well as decrease the magnetic moment, point towards rich possibilities for light control over magnetic matter at femtosecond times. |
| title | Giant moment increase by ultrafast laser light |
| topic | Materials Science Other Condensed Matter Optics Quantum Physics |
| url | https://arxiv.org/abs/2503.02396 |