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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2208.04098 |
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| _version_ | 1866929598389813248 |
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| author | Majchrzak, Paulina Liu, Yuntian Volckaert, Klara Biswas, Deepnarayan Sahoo, Chakradhar Puntel, Denny Bronsch, Wibke Tuniz, Manuel Cilento, Federico Pan, Xing-Chen Liu, Qihang Chen, Yong P. Ulstrup, Søren |
| author_facet | Majchrzak, Paulina Liu, Yuntian Volckaert, Klara Biswas, Deepnarayan Sahoo, Chakradhar Puntel, Denny Bronsch, Wibke Tuniz, Manuel Cilento, Federico Pan, Xing-Chen Liu, Qihang Chen, Yong P. Ulstrup, Søren |
| contents | Heterostructures composed of the intrinsic magnetic topological insulator MnBi$_2$Te$_4$ and its non-magnetic counterpart Bi$_2$Te$_3$ host distinct surface electronic band structures depending on the stacking order and exposed termination. Here, we probe the ultrafast dynamical response of MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ following near-infrared optical excitation using time- and angle-resolved photoemission spectroscopy, and disentangle surface from bulk dynamics based on density functional theory slab calculations of the surface-projected electronic structure. We gain access to the out-of-equilibrium charge carrier populations of both MnBi$_2$Te$_4$ and Bi$_2$Te$_3$ surface terminations of MnBi$_4$Te$_7$, revealing an instantaneous occupation of states associated with the Bi$_2$Te$_3$ surface layer followed by carrier extraction into the adjacent MnBi$_2$Te$_4$ layers with a laser fluence-tunable delay of up to 350 fs. The ensuing thermal relaxation processes are driven by phonon scattering with significantly slower relaxation times in the magnetic MnBi$_2$Te$_4$ septuple layers. The observed competition between interlayer charge transfer and intralayer phonon scattering demonstrates a method to control ultrafast charge transfer processes in MnBi$_2$Te$_4$-based van der Waals compounds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_04098 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures Majchrzak, Paulina Liu, Yuntian Volckaert, Klara Biswas, Deepnarayan Sahoo, Chakradhar Puntel, Denny Bronsch, Wibke Tuniz, Manuel Cilento, Federico Pan, Xing-Chen Liu, Qihang Chen, Yong P. Ulstrup, Søren Materials Science Heterostructures composed of the intrinsic magnetic topological insulator MnBi$_2$Te$_4$ and its non-magnetic counterpart Bi$_2$Te$_3$ host distinct surface electronic band structures depending on the stacking order and exposed termination. Here, we probe the ultrafast dynamical response of MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ following near-infrared optical excitation using time- and angle-resolved photoemission spectroscopy, and disentangle surface from bulk dynamics based on density functional theory slab calculations of the surface-projected electronic structure. We gain access to the out-of-equilibrium charge carrier populations of both MnBi$_2$Te$_4$ and Bi$_2$Te$_3$ surface terminations of MnBi$_4$Te$_7$, revealing an instantaneous occupation of states associated with the Bi$_2$Te$_3$ surface layer followed by carrier extraction into the adjacent MnBi$_2$Te$_4$ layers with a laser fluence-tunable delay of up to 350 fs. The ensuing thermal relaxation processes are driven by phonon scattering with significantly slower relaxation times in the magnetic MnBi$_2$Te$_4$ septuple layers. The observed competition between interlayer charge transfer and intralayer phonon scattering demonstrates a method to control ultrafast charge transfer processes in MnBi$_2$Te$_4$-based van der Waals compounds. |
| title | Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures |
| topic | Materials Science |
| url | https://arxiv.org/abs/2208.04098 |