Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures
| Autor: | Paulina Ewa Majchrzak, Yuntian Liu, Klara Volckaert, Deepnarayan Biswas, Chakradhar Sahoo, Denny Puntel, Wibke Bronsch, Manuel Tuniz, Federico Cilento, Xing-Chen Pan, Qihang Liu, Yong P. Chen, Søren Ulstrup |
|---|---|
| Přispěvatelé: | Majchrzak, Paulina Ewa, 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 |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
MnBi2Te4
density functional theory magnetic topological insulators time- and angle-resolved photoemission spectroscopy ultrafast carrier dynamics van der Waals heterostructures Condensed Matter - Materials Science Mechanical Engineering Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences MnBiTe Bioengineering General Chemistry Condensed Matter Physics ultrafast carrier dynamic magnetic topological insulator General Materials Science |
| Zdroj: | Majchrzak, P E, Liu, Y, Volckaert, K, Biswas, D, Sahoo, C, Puntel, D, Bronsch, W, Tuniz, M, Cilento, F, Pan, X C, Liu, Q, Chen, Y P & Ulstrup, S 2023, ' Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures ', Nano Letters, vol. 23, no. 2, pp. 414-421 . https://doi.org/10.1021/acs.nanolett.2c03075 |
| Popis: | Heterostructures composed of the intrinsic magnetic topological insulator MnBi$_2$Te$_4$ and its non-magnetic counterpart Bi$_2$Te$_3$ host distinct surface band structures depending on the stacking order and exposed termination, allowing fine control of their magnetic, electronic and optical properties. 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. We gain access to the out-of-equilibrium surface electronic structure of both MnBi$_2$Te$_4$ and Bi$_2$Te$_3$ surface terminations of MnBi$_4$Te$_7$, revealing an instantaneous occupation of states that are resonant with the optical excitation in the Bi$_2$Te$_3$ 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 in-plane phonon scattering with significantly slower relaxation times in the magnetic MnBi$_2$Te$_4$ septuple layers. The competition of interlayer charge transfer and intralayer phonon scattering establishes MnBi$_2$Te$_4$-based compounds as a platform for controlling ultrafast charge transfer processes in combination with magnetism and topology in van der Waals heterostructures. 17 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|