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| Home > Publications database > Spin- and angle-resolved photoemission studies at the VUV undulator beamline BL5 of the synchrotron radiation facility DELTA |
| Conference Presentation (Other) | FZJ-2015-01080 |
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2014
Abstract: The experimental endstation at the beamline BL5 of the synchrotron radiationfacility DELTA at the TU Dortmund is optimized for spin- and angle-resolvedphotoemission experiments in the VUV regime. The hemispherical electronanalyzer is equipped with a SPLEED detector for spin-resolved photoemissionas well as a two dimensional delay line detector for angle-resolvedmeasurements. The two detectors can be operated semi-simultaneously,therefore, a combination of spin- and angle-resolved measurements on thesame sample species becomes feasible. In addition, the undulator U250 and theplain grating monochromator beamline BL5 are optimized for high brilliance inthe VUV and low energy soft x-ray range, which is in particular suitable forspin-resolved experiments where obtaining ample countrates is usuallychallenging.At the moment, a time-resolved modus for the experiments is undercommissioning. In a close collaboration with the machine group of DELTA(AG Khan, TU Dortmund), a laser is used to produce ultra-short VUV pulses inthe fs-regime via the so-called coherent harmonic generation principle. A partof this seeding laser can be used as a pump laser for pump-probe experiments.During the last few years, the beamline was mainly used to investigatetopological insulators and thin magnetic films. For those sample systems, thecombination of spin- and angle-resolved photoemission experiments wasessential in order characterize the spin-texture of the electronic band structures.In our contribution, we will show those experimental results and give anoutlook on the new time-resolved modus that is currently undercommissioning.
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