Bulk photogalvanic current control and gap spectroscopy in 2D hexagonal materials
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911142206504960 |
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| author | Galler, Anna Neufeld, Ofer |
| author_facet | Galler, Anna Neufeld, Ofer |
| contents | Two-dimensional (2D) hexagonal materials have been intensively explored for multiple optoelectronic applications such as spin current generation, all-optical valleytronics, and topological electronics. In the realm of strong-field and ultrafast light-driven phenomena, it was shown that tailored laser driving such as polychromatic or few-cycle pulses can drive robust bulk photogalvanic (BPG) currents originating from the K/K' valleys. We here explore the BPG effect in 2D systems in the strong-field regime and show that monochromatic elliptical pulses also generically generate such photocurrents. The resultant photocurrents exhibit both parallel and transverse (Hall-like) components, both highly sensitive to the laser parameters, providing photocurrent control knobs. Interestingly, we show that the photocurrent amplitude has a distinct behavior vs. the driving ellipticity that can be indicative of material properties such as the gap size at K/K', which should prove useful for novel forms of BPG-based spectroscopies. We demonstrate these effects also in benchmark ab-initio simulations in monolayer hexagonal boron-nitride. Our work establishes new paths for controlling photocurrent responses in 2D systems that can also be used for multi-dimensional spectroscopy of ultrafast material properties through photocurrent measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_14236 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bulk photogalvanic current control and gap spectroscopy in 2D hexagonal materials Galler, Anna Neufeld, Ofer Materials Science Optics Two-dimensional (2D) hexagonal materials have been intensively explored for multiple optoelectronic applications such as spin current generation, all-optical valleytronics, and topological electronics. In the realm of strong-field and ultrafast light-driven phenomena, it was shown that tailored laser driving such as polychromatic or few-cycle pulses can drive robust bulk photogalvanic (BPG) currents originating from the K/K' valleys. We here explore the BPG effect in 2D systems in the strong-field regime and show that monochromatic elliptical pulses also generically generate such photocurrents. The resultant photocurrents exhibit both parallel and transverse (Hall-like) components, both highly sensitive to the laser parameters, providing photocurrent control knobs. Interestingly, we show that the photocurrent amplitude has a distinct behavior vs. the driving ellipticity that can be indicative of material properties such as the gap size at K/K', which should prove useful for novel forms of BPG-based spectroscopies. We demonstrate these effects also in benchmark ab-initio simulations in monolayer hexagonal boron-nitride. Our work establishes new paths for controlling photocurrent responses in 2D systems that can also be used for multi-dimensional spectroscopy of ultrafast material properties through photocurrent measurements. |
| title | Bulk photogalvanic current control and gap spectroscopy in 2D hexagonal materials |
| topic | Materials Science Optics |
| url | https://arxiv.org/abs/2504.14236 |