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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2310.01093 |
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| _version_ | 1866909061412290560 |
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| author | Murotani, Yuta Kanda, Natsuki Fujimoto, Tomohiro Matsuda, Takuya Goyal, Manik Yoshinobu, Jun Kobayashi, Yohei Oka, Takashi Stemmer, Susanne Matsunaga, Ryusuke |
| author_facet | Murotani, Yuta Kanda, Natsuki Fujimoto, Tomohiro Matsuda, Takuya Goyal, Manik Yoshinobu, Jun Kobayashi, Yohei Oka, Takashi Stemmer, Susanne Matsunaga, Ryusuke |
| contents | Chirality of massless fermions emergent in condensed matter is a key to understand their characteristic behavior as well as to exploit their functionality. However, chiral nature of massless fermions in Dirac semimetals has remained elusive, due to equivalent occupation of carriers with the opposite chirality in thermal equilibrium. Here, we show that the isospin degree of freedom, which labels the chirality of massless carriers from a crystallographic point of view, can be injected by circularly polarized light. Terahertz Faraday rotation spectroscopy successfully detects the anomalous Hall conductivity by a light-induced isospin polarization in a three-dimensional Dirac semimetal, Cd$_3$As$_2$. Spectral analysis of the Hall conductivity reveals a long scattering time and a long decay time, which are characteristic of the isospin. The long-lived, robust, and reversible character of the isospin promises potential application of Dirac semimetals in future information technology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_01093 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Anomalous Hall transport by optically injected isospin degree of freedom in Dirac semimetal thin film Murotani, Yuta Kanda, Natsuki Fujimoto, Tomohiro Matsuda, Takuya Goyal, Manik Yoshinobu, Jun Kobayashi, Yohei Oka, Takashi Stemmer, Susanne Matsunaga, Ryusuke Mesoscale and Nanoscale Physics Chirality of massless fermions emergent in condensed matter is a key to understand their characteristic behavior as well as to exploit their functionality. However, chiral nature of massless fermions in Dirac semimetals has remained elusive, due to equivalent occupation of carriers with the opposite chirality in thermal equilibrium. Here, we show that the isospin degree of freedom, which labels the chirality of massless carriers from a crystallographic point of view, can be injected by circularly polarized light. Terahertz Faraday rotation spectroscopy successfully detects the anomalous Hall conductivity by a light-induced isospin polarization in a three-dimensional Dirac semimetal, Cd$_3$As$_2$. Spectral analysis of the Hall conductivity reveals a long scattering time and a long decay time, which are characteristic of the isospin. The long-lived, robust, and reversible character of the isospin promises potential application of Dirac semimetals in future information technology. |
| title | Anomalous Hall transport by optically injected isospin degree of freedom in Dirac semimetal thin film |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2310.01093 |