Dichroism and photoelectron spin-polarization of complex quantum materials

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This project is based on a joint experimental and theoretical study with the aim to disentangle the complex dependence of the photoemission signal from the noumerous experimental parameters, which can be particularly well controlled and systematically varied at modern synchrotron radiation facilities, e.g. experimental geometry, polarization of the light, photon energy and access to spin-polarization of the photoelectrons. The exploration of this multi-dimensional parameter space requires elaborated theoretical approaches which have to be adapted in detail to the experiment. In particular, we are planning to investigate circular and linear dichroism as probes of orbital angular momentum, complementary to spin polarized measurements, to relate the observables to the intrinsic topological properties, to extend these studies towards magnetically ordered systems, and to combine these studies with newly introduced intrinsic dichroic observables (TRDAD, iLDAD) that may provide an even more direct access to the electronic initial-state properties. Therefore, we will perform systematic state-of-the-art spin-resolved and dichroism ARPES experiments as well as specific theoretical photoemission calculations on several prototypical material systems with complex physical properties.