Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866909600072073216 |
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| author | Karmakar, Abhirup Roy Taraphder, A. Das, G. P. |
| author_facet | Karmakar, Abhirup Roy Taraphder, A. Das, G. P. |
| contents | The recent discovery of the Weyl semimetal CeAlSi with simultaneous breaking of inversion and time-reversal symmetries has opened up new avenues for research into the interaction between light and topologically protected bands. In this work, we present a comprehensive examination of the shift current and injection current responsible for the circular photogalvanic effect in CeAlSi using first-principles calculations. Our investigation identifies a significant injection current of 4 mA/V$^2$ over a broad range in the near-infrared region of the electromagnetic spectrum, exceeding previously reported findings. In addition, we explored several externally controllable parameters to further enhance the photocurrent. A substantial boost in the injection current is observed when applying uniaxial strain along the $c$ axis of the crystal: a 5% strain results in a remarkable 64% increment. The exceptional photocurrent response in CeAlSi suggests that magnetic non-centrosymmetric Weyl semimetals may provide promising opportunities for novel photogalvanic applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_00045 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi Karmakar, Abhirup Roy Taraphder, A. Das, G. P. Mesoscale and Nanoscale Physics Materials Science The recent discovery of the Weyl semimetal CeAlSi with simultaneous breaking of inversion and time-reversal symmetries has opened up new avenues for research into the interaction between light and topologically protected bands. In this work, we present a comprehensive examination of the shift current and injection current responsible for the circular photogalvanic effect in CeAlSi using first-principles calculations. Our investigation identifies a significant injection current of 4 mA/V$^2$ over a broad range in the near-infrared region of the electromagnetic spectrum, exceeding previously reported findings. In addition, we explored several externally controllable parameters to further enhance the photocurrent. A substantial boost in the injection current is observed when applying uniaxial strain along the $c$ axis of the crystal: a 5% strain results in a remarkable 64% increment. The exceptional photocurrent response in CeAlSi suggests that magnetic non-centrosymmetric Weyl semimetals may provide promising opportunities for novel photogalvanic applications. |
| title | Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2308.00045 |