Bulk photovoltaic effects in altermagnets
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866912384623312896 |
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| author | Ezawa, Motohiko |
| author_facet | Ezawa, Motohiko |
| contents | The bulk photovoltaic effect is a photocurrent generation from alternating electric field, which is a promising candidate for future efficient solar cell technology. It is the second-order optical current, which is the injection current or the shift current. We focus on the direct current generation. By employing a simple two-band model of the $d$-wave altermagnet coupled with the Rashba interaction, we show that the linearly polarized light can generate the injection and shift currents when the Néel vector points to an in-plane direction. The magnitude of the injection current is almost constant over a wide range of the frequency $ω$ of the applied light provided it is smaller than a certain critical frequency $ω_{\text{c}}$ and larger than the bulk gap energy $\varepsilon _{\text{gap}}$, $\varepsilon _{\text{gap}}<\hbar ω<\hbar ω_{\text{c}}$. Hence, the use of the injection current is quite efficient for solar cell technology because any photon whose energy is within this range can be equally utilized. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_16477 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bulk photovoltaic effects in altermagnets Ezawa, Motohiko Mesoscale and Nanoscale Physics The bulk photovoltaic effect is a photocurrent generation from alternating electric field, which is a promising candidate for future efficient solar cell technology. It is the second-order optical current, which is the injection current or the shift current. We focus on the direct current generation. By employing a simple two-band model of the $d$-wave altermagnet coupled with the Rashba interaction, we show that the linearly polarized light can generate the injection and shift currents when the Néel vector points to an in-plane direction. The magnitude of the injection current is almost constant over a wide range of the frequency $ω$ of the applied light provided it is smaller than a certain critical frequency $ω_{\text{c}}$ and larger than the bulk gap energy $\varepsilon _{\text{gap}}$, $\varepsilon _{\text{gap}}<\hbar ω<\hbar ω_{\text{c}}$. Hence, the use of the injection current is quite efficient for solar cell technology because any photon whose energy is within this range can be equally utilized. |
| title | Bulk photovoltaic effects in altermagnets |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.16477 |