Biographical Information:
Tomasz Dietl is a Head and a Professor at the International Centre for Interfacing Magnetism and Superconductivity with Topological Matter - MagTop, funded since 2017 by EU and the Foundation for Polish Science, and carried out at the Institute of Physics, Polish Academy of Sciences in Warsaw, where he completed PhD in 1977 and habilitation in 1983. His current research interests are focused on the development of material systems and device concepts for nanospintronics of topological materials, ferromagnetic and antiferromagnetic semiconductors, and of hybrid metal/semiconductor nanostructures. Dietl was a postdoctoral researcher at Ecole Polytechnique in Paris (1978) and at Munich Technical University (1984/85). Later he was appointed as a visiting professor at Kepler University in Linz, Fourier University in Grenoble, Tohoku University in Sendai, Paris Sud University in Orsay, and Regensburg University. He was also an a part-time ordinary professor at the Institute of Theoretical Physics at the University of Warsaw (2004-2016) and a part-time Principal Investigator and Professor at the Advanced Institute for Materials Research, Tohoku University in Sendai (2012-2023). He is recipient of Maria Skłodowska-Curie Award in Poland (1997); Alexander von Humboldt Research Award in Germany (2003); Agilent Technologies Europhysics Prize (2005) with David D. Awschalom and Hideo Ohno, for pioneering works that paved the way for the emergence of semiconductor spintronics; Foundation for Polish Science Prize (2006), and the Marian Smoluchowski Medal of the Polish Physical Society (2010). In 2008 Tomasz Dietl obtained an Advanced Grant (FunDMS) of the European Research Council.Abstract:
Understanding magnetic topological matter by computational approachesSurprising physics of magnetic topological materials and possible applications in sensors, metrology, computing, and catalysis have triggered experimental and computational search for compounds with robust topological functionalities coexisting with or brought about by a magnetic order. In particular, high-throughput first-principles calculations, implementing the generalized gradient approximation (GGA)+Hubbard U, indicated that 130 compounds out of 430 magnetic materials studied have topological phases when scanning U [Y. Xu et al., Nature 586, 702 (2020)]. We have demonstrated that more computationally demanding approaches are necessary to properly identify topological classes [1] and, in particular, to explain the experimentally observed band gap in EuCd2As2 and its red shift in a magnetic field [2]. We have found that EuSn2As2, EuCd2Bi2, EuCd2SbBi, and BaIn2As2 are robust topological materials while all other compounds are topologically trivial semiconductors, not Weyl semimetals, as claimed so-far. Additionally, the EuIn2X2 (X = P, As) compounds show altermagnetic exchange-induced band spin-splitting [1]. We have also studied magnetically doped HgTe, and predicted (i) the existence of the quantum anomalous Hall effect in (Hg,Cr)Te quantum wells (QWs) [3,4], but not in (Hg,V)Te QWs [4] (ii) the critical role of bound magnetic polarons in the quantum spin Hall effect in (Hg,Mn)Te QWs [5]; (iii) the dominance of the superexchange over the Van Vleck mechanism [6], and (iv) the origin of reduced exchange splitting away from the Brillouin zone centre [7].
Acknowledgements:
International Centre for Interfacing Magnetism and Superconductivity with Topological Matter – MagTop is supported by the Foundation for Polish Science through the International Research Agendas Programme co-financed by the European Funds for Smart Economy.
References
[1] G. Cuono, R. M. Sattigeri, C. Autieri, T. Dietl, Phys. Rev. B 108, 075150 (2023).
[2] D. Santos-Cottin et al., Phys. Rev. Lett. 131, 186704 (2023).
[3] C. Śliwa, T. Dietl, arXiv:2310.19856 (2023).
[4] G. Cuono, C. Autieri, T. Dietl, arXiv:2312.16732 (2023).
[5] T. Dietl, Phys. Rev. Lett. 130, 086202 (2023); Phys. Rev. B 107, 085421 (2023).
[6] C. Śliwa, C. Autieri, J. A. Majewski, T. Dietl, Phys. Rev. B 104, L220404 (2021).
[7] C. Autieri, C. Śliwa, R. Islam, G. Cuono, T. Dietl, Phys. Rev. B 103, 115209 (2021).