Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 61: Topology and Symmetry-Protected Materials (joint session O/MA/TT)

TT 61.9: Vortrag

Donnerstag, 4. April 2019, 17:30–17:45, H24

Exploring the spin-orbital texture in a Dirac heavy metal by spin-resolving momentum microscopy — •Ying-Jiun Chen1,2, Christian Tusche1,2, Markus Hoffmann3, Bernd Zimmermann3, Gustav Bihlmayer3, Stefan Blügel3, and Claus Michael Schneider1,21Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Fakultät für Physik, Universität Duisburg-Essen, 47057 Duisburg, Germany — 3Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Entanglement of spin and orbital degrees of freedom in strongly spin-orbit coupled materials creates exotic spin/orbital textures in momentum space such as Rashba and topological protected surface states. Dichroism in spin-polarized photoemission plays a crucial role in understanding the influence of spin-orbit coupling on the electronic wave functions. By virtue of the recent invention of the spin-resolving Momentum Microscope, the spin-detection efficiency and momentum resolution has been improved tremendously. This development makes it now possible to probe the photoelectron spin polarization as well as linear and circular dichroism in the angular distribution over the whole Brillouin zone. In addition to the d-electron-drived Dirac-type helical spin texture, we directly characterize the momentum-dependent spin-orbital entangled states on W(110) throughout the entire surface Brillouin zone by using differently polarized light. Comparison between theory and experiment provides insights into the large anisotropy of spin relaxation in the prototype Dirac heavy metal.

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