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MA: Fachverband Magnetismus

MA 9: Weyl Semimetals

MA 9.3: Vortrag

Montag, 16. März 2020, 12:00–12:15, POT 6

One step model photoemission studies of WTe2 and HfTe2 compared to the experiment — •J. Schusser^1,2, L. Nicolaï¹, M. Fanciulli^2,3, M.-i Lee², Z. El Youbi^2,4, M. C. Richter², O. Heckmann², D. Bresteau³, T. Ruchon³, K. Hricovini², and J. Minár¹ — ¹NTC, U. of West Bohemia, Czech Republic — ²LPMS, U. of Cergy-Pontoise, France — ³ATTOLab, CEA, France — ⁴DLS, Harwell Campus, United Kingdom

Mo dichalcogenides are probably the most studied TMDCs by virtue of being appealing for various possible reasons suchlike spin or valley pseudospin and their interactions. W-based counterparts are on the other hand evincing much stronger spin-orbit coupling due to which all the spin-related effects are more stable at room temperature and thus more feasible for application. WTe2, the type-II Weyl semimetal candidate is in particular interesting due to the possibility of having spin-differentiated Weyl points above Fermi energy. We have conducted several pump-probe experiments following the evolution of the band dispersion in the vicinity of X and Y points of WTe2 and TR-SARPES experiments in the part of Brillouin zone where the presence of Weyl points is predicted. The study was supported by Ab-initio one-step model photoemission calculations using SPR-KKR package and compared to experiment the remarkable agreement of which helps us to disentangle the subsequent relaxation processes. We have also conducted a preliminary band structure calclulations of HfTe2 revealing the high potential of SPR-KKR package for calculating the band dispersion of layered materials by including geometry effects of the experiment as well as the polarization and energy of the incoming light.