Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917889326448640 |
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| author | Majchrzak, Paulina Sanders, Charlotte Zhang, Yu Kuibarov, Andrii Suvorov, Oleksandr Springate, Emma Kovalchuk, Iryna Aswartham, Saicharan Shipunov, Grigory Büchner, Bernd Yaresko, Alexander Borisenko, Sergey Hofmann, Philip |
| author_facet | Majchrzak, Paulina Sanders, Charlotte Zhang, Yu Kuibarov, Andrii Suvorov, Oleksandr Springate, Emma Kovalchuk, Iryna Aswartham, Saicharan Shipunov, Grigory Büchner, Bernd Yaresko, Alexander Borisenko, Sergey Hofmann, Philip |
| contents | Using time- and angle-resolved photoemission spectroscopy, we examine the unoccupied electronic structure and electron dynamics of the type-I Weyl semimetal PtBi$_2$. Using the ability to change the probe photon energy over a wide range, we identify the predicted Weyl points in the unoccupied three-dimensional band structure and we discuss the effect of $k_\perp$ broadening in the normally unoccupied states. We characterise the electron dynamics close to the Weyl point and in other parts of three-dimensional Brillouin zone using $k$-means, an unsupervised machine learning technique. This reveals distinct differences -- in particular, dynamics that are faster in the parts of the Brillouin zone that host most of the bulk Fermi surface than in parts close to the Weyl points. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_10550 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi$_2$ Majchrzak, Paulina Sanders, Charlotte Zhang, Yu Kuibarov, Andrii Suvorov, Oleksandr Springate, Emma Kovalchuk, Iryna Aswartham, Saicharan Shipunov, Grigory Büchner, Bernd Yaresko, Alexander Borisenko, Sergey Hofmann, Philip Strongly Correlated Electrons Using time- and angle-resolved photoemission spectroscopy, we examine the unoccupied electronic structure and electron dynamics of the type-I Weyl semimetal PtBi$_2$. Using the ability to change the probe photon energy over a wide range, we identify the predicted Weyl points in the unoccupied three-dimensional band structure and we discuss the effect of $k_\perp$ broadening in the normally unoccupied states. We characterise the electron dynamics close to the Weyl point and in other parts of three-dimensional Brillouin zone using $k$-means, an unsupervised machine learning technique. This reveals distinct differences -- in particular, dynamics that are faster in the parts of the Brillouin zone that host most of the bulk Fermi surface than in parts close to the Weyl points. |
| title | Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2406.10550 |