First-principles transport including magnetic and spin-orbit effects
ORAL · Invited
Abstract
Topology is the next frontier in materials science, opening possibilities for ultra low power devices, exquisite sensing capabilities, and synergies with quantum computing through the protection of state coherence.
We will showcase recent advances in the theory and applications of first-principles transport calculations, to include magnetism and spin-orbit interactions, and what will be needed to tackle the most complex topological materials, which contain both effects. Using spinor wave functions and SOC naturally incorporates spin-flip processes in electron-phonon scattering. Comparisons to experiments on "simple" 3d ferromagnetic metals require the inclusion of electron-magnon scattering, both in resistivity and in magnon drag.
As a further step into topology, we have calculated the first-principles conductivity of Weyl semi-metals, in particular TaAs for which our calculations are in good agreement with available experiments. Finally, magnetoelectrically-active 2D Nickel Iodide can host topological magnetic states, and we find that it shows strong sensitivity to pressure. Combining experimental characterization with first and second principles simulations, we determine the pressure dependency (up to 20 GPa) of the electronic band structure, magnetic phase transition, and spinwave dispersion.
- X Ma et al. New J Phys 25, 043022 (2023)
- G Allemand and MJ Verstraete, unpublished (2023)
- J Kapeghian et al. arxiv.org/abs/2306.04729
- C Occhialini et al. arxiv.org/abs/2306.11720
We will showcase recent advances in the theory and applications of first-principles transport calculations, to include magnetism and spin-orbit interactions, and what will be needed to tackle the most complex topological materials, which contain both effects. Using spinor wave functions and SOC naturally incorporates spin-flip processes in electron-phonon scattering. Comparisons to experiments on "simple" 3d ferromagnetic metals require the inclusion of electron-magnon scattering, both in resistivity and in magnon drag.
As a further step into topology, we have calculated the first-principles conductivity of Weyl semi-metals, in particular TaAs for which our calculations are in good agreement with available experiments. Finally, magnetoelectrically-active 2D Nickel Iodide can host topological magnetic states, and we find that it shows strong sensitivity to pressure. Combining experimental characterization with first and second principles simulations, we determine the pressure dependency (up to 20 GPa) of the electronic band structure, magnetic phase transition, and spinwave dispersion.
- X Ma et al. New J Phys 25, 043022 (2023)
- G Allemand and MJ Verstraete, unpublished (2023)
- J Kapeghian et al. arxiv.org/abs/2306.04729
- C Occhialini et al. arxiv.org/abs/2306.11720
*We acknowledge DREAMS ARC (G.A. 21/25-11) funded by Federation Wallonie Bruxelles and ULiege, EOS CONNECT # 40007563 and ALPS PdR Grant # T.0103.19, funded by FWO and FNRS.
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Publication: - X Ma et al. New J Phys 25, 043022 (2023)
- G Allemand and MJ Verstraete, unpublished (2023)
- J Kapeghian et al. arxiv.org/abs/2306.04729
- C Occhialini et al. arxiv.org/abs/2306.11720
Presenters
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Matthieu J Verstraete
- University of Liege
- nanomat/QMAT/CESAM and Department of Physics, University of Liege