Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Topological Semimetals - Experiment (joint session TT/MA)
MA 48.10: Vortrag
Donnerstag, 4. April 2019, 17:30–17:45, H2
Spin-orbital texture in MoTe2 and its response to the phase transition — •Andrew Patton Weber1,2,3, Philipp Rüßmann4, Nan Xu2,3, Stefan Muff2,3, Mauro Fanciulli2,3, Arnaud Magrez2, Philippe Bugnon2, Helmuth Berger2, Nicholas C. Plumb3, Ming Shi3, Stefan Blügel4, Phivos Mavropoulos4, and J. Hugo Dil2,3 — 1Donostia International Physics Center, 20018 Donostia, Gipuzkoa, Spain — 2Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland — 3Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland — 4Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
The basis of exotic electromagnetic phenomena in MoTe2 lies not only in the electronic band structure, but also in the crystal-momentum-dependence of spin-orbit-entangled wave functions. Here we discuss the challenges involved in obtaining this information directly from experiments and report the angular distribution of photoelectron spin-polarization and intensity dichroism in MoTe2. A novel spin-orbital texture is uncovered in the bulk Fermi surface that is consistent with first-principles calculations. The spin-texture is three-dimensional and is not completely suppressed above the centrosymmetry-breaking transition temperature of the bulk crystal. The results indicate that a new form of polar instability exists near the surface when the bulk is largely in a centrosymmetric phase.