Descrição e requisitos:
Approximate starting date: Oct. 1st, 2022
Location : Laboratoire de Physique et Etude de Matériaux- ESPCI
10 Rue Vauquelin, 75005 Paris, France
Advisor: kamran Behnia
The past decade has witnessed the discovery of materials combining complex spin texture with topologically non-trivial electronic band structure [1]. One example is the non-collinear antiferromagnet Mn3Sn displaying a large anomalous Hall effect (AHE), detectable at room temperature and tamable with a small sub-Tesla magnetic field [2]. Thermoelectric and thermal counterparts of the AHE (namely anomalous Nernst and anomalous Thermal Hall) effects were measured [3,4] open an additional window to the Berry spectrum of these topological magnets [5]. The magnitudes of various anomalous thermoelectric coefficients were found to correlate with each other though fundamental constants [6, 7]. The thesis aims to explore the dynamics of topologically non-trivial magnetic domain walls [8,9] in magnets such as Mn3Sn, Mn3Ge and Co3Sn2S2 using a combination of, electrodes, local thermometers, micrometric Hall sensors and strain.
1. L. Šmejkal, Y. Mokrousov, B. Yan & A. H. MacDonald, Nature Physics 14, 242 (2018)
2. S. Nakatsuji, N. Kiyohara and T. Higo, Nature 527, 212 (2015)
3. M. Ikhlas, T. Tomita, T. Koretsune, M. T. Suzuki, D. Nishio-Hamane, R. Arita. Y. Otani, S. Nakatsuji, Nat. Phys. 13, 1085 (2017)
4. X. Li, L. Xu, L. Ding, J. Wang, M. Shen, X. Lu, Z. Zhu, K. Behnia, Phys. Rev. Lett. 119, 056601 (2017).
5. L. Xu, X. Li, X. Lu, C. Collignon, H. Fu, B. Fauqué, B. Yan, Z. Zhu, K. Behnia, Science Advances 6 : eaaz3522 (2020)
6. L. Xu, X. Li, L. Ding, T. Chen, A. Sakai, B. Fauqué, S. Nakatsuji, Z. Zhu, and K. Behnia, Phys. Rev. B 101, 180404 (R) (2020)
7. L Ding, J Koo, L Xu, X Li, X Lu, L Zhao, Q Wang, Q Yin, H Lei, B Yan, Z. Zhu and K. Behnia, Physical Review X 9, 041061 (2019)
8. J. Liu & L. Balents, Phys. Rev. Lett. 119, 087202 (2017).
9. X. Li, C. Collignon, L. Xu, H. Zuo, A. Cavanna, U. Gennser, D. Mailly, B. Fauqué, L. Balents, Z. Zhu and K. Behnia, Nature Commun. 10: 3021 (2019)
Remuneração e benefícios:
Funding for three years is granted by CNRS.
