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PhD position: Theoretical and experimental spect ... (No replies)
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Although many experimental methods give important information about the properties of complex and topologically non-trivial materials [1,2], photoemission spectroscopy, namely ARPES plays a crucial role in the approach to the microscopic origin of these properties. The goal of this project is to improve schemes for detection and qualifications of the topologically non-trivial materials by utilizing a combination of experimental data with state-of-the-art first principle photoemission calculations utilizing the one-step model of photoemission and density functional theory (DFT). Spin-polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR) band structure software package [3,4] gives access to a photoemission signal with an accurate angular variation of ARPES spectral weight caused by an experimental geometry, photon energy and polarization state or surface termination [5-7]. Besides scrutinizing simple topological Weyl semimetals, we would like to disentangle a competing influence of the spin degree of freedom in materials with both strong spin-orbit coupling and magnetic order (e.g. in MnBi2Te4 [8]). The calculated spectra will be compared to experimental measurements of the observables of the photoemission experiment (photointensity, linear and circular dichroism, photoelectron spin-polarization, ...) and discussed in the context of topological properties – e. g. Berry flux monopoles or nodal lines identification in the band structure. This work will also benefit from a close collaboration with the photoemission theory group of Prof. Dr. Ján Minár at NTC, University of West Bohemia in Pilsen, Czech Republic (several scientific visits in Pilsen will be financed). The applicant will also have an opportunity of participating during the synchrotron beamtimes.
Position details: 1/2 x E13 (TVL) – 3.5-year contract starting on 1. 4. 2022, financed by the Center of Excellence ct.qmat
If you are interested, highly motivated and open for international collaborations, please contact
Prof. Dr. Friedrich Reinert, EP VII, University of Würzburg or
Dr. Jakub Schusser, EP VII, University of Würzburg, [email protected]
References:
[1] I. Belopolski, S. Y. Xu, D. S. Sanchez et al., Physical Review Letters 116, 1 (2016)
[2] S. Y. Xu, I. Belopolski, D. S. Sanchez et al., Science Advances 1, 10.1126/sciadv.1501092 (2015)
[3] H. Ebert, D. Ködderitzsch, and J. Minár, Rep. Prog. Phys. 74, 096501 (2011).
[4] J. Braun, J. Minár, and H. Ebert, Phys. Rep. 740, 1 (2018).
[5] S. Beaulieu, J. Schusser, S. Dong et al., Physical Review Letters 125, 216404 (2020)
[6] S. Beaulieu, M. Schüler, J. Schusser et al., npj Quantum Mater. 6, 93 (2021).
[7] R. Ono, A. Marmodoro, J. Schusser et al., Physical Review B 103, 125139 (2021).
[8] R. C. Vidal, H. Bentmann, J. I. Facio et al., Phys. Rev. Lett. 126, 176403 (2021)