Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 104: Ultrafast Electron Dynamics III (joint session O/MA)
O 104.6: Talk
Thursday, March 19, 2020, 11:45–12:00, WIL B321
Heavy fermion dynamics in semimetallic and insulating phases — •chul-hee min1, michael heber2, simon müller3, lukas wenthaus2, steffen palutke2, dmytro kutnyakhov2, federico pressacco4, lenart dudy5, mathieu silly5, celso fornari3, kiana baumgärtner3, hendrik bentmann3, woojae choi6, yong seung kwon6, markus scholz7, friedrich reinert3, wilfried wurth2,4, and kai rossnagel1,2 — 1IEAP, CAU Kiel, Germany — 2DESY, Hamburg, Germany — 3EP7 and ct.qmat, University of Würzburg, Germany — 4Department of Physics, University of Hamburg, Germany — 5Synchrotron-SOLEIL, Saint-Aubin, France — 6Department of Emerging Materials Science, DGIST, Republic of Korea — 7European XFEL GmbH, Schenefeld, Germany
Due to time–energy correlation, heavy fermion systems with hard-to-detect meV energy scales are expected to show relatively slow dynamics on ps time scales, which are relatively easy to measure. Using the free-electron laser FLASH, we have performed time-resolved pump-probe photoemission spectroscopy of mixed valent TmSe1−xTex. The system is composed of two magnetic 4f12 and 4f13 configurations in the ground state and can be tuned from semimetallic to insulating behavior via the Te concentration x without destroying the periodicity of the Tm ions. Here, we present and discuss the transient dynamics of the 4f states near EF showing a remarkably strong dependence on x.