Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Ultrafast Electron Dynamics at Surfaces and Interfaces 2

O 9.1: Vortrag

Montag, 5. September 2022, 15:00–15:15, H3

Two distinct 4f states in mixed-valent TmSe_1−xTe_x — •Chul hee Min¹, Michael Heber², Simon Müller³, Lukas Wenthaus², Markus Schoz², Dmytro Kutnyakhov², Lenart Dudy⁴, Hendrik Bentmann³, Federico Pressacco², Matthias Kalläne¹, Woojae Choi⁵, Yong Seung Kwon⁵, Friedrich Reinert³, and Kai Rossnagel¹ — ¹IEAP, CAU Kiel, Germany — ²DESY, Hamburg, Germany — ³EP7 and ct.qmat, University of Würzburg, Germany — ⁴Synchrotron SOLEIL, Saint-Aubin, France — ⁵Dep. of EMS, DGIST, South Korea

From the strong electron correlation effects in rare earth compounds, rich phase diagrams emerge with tunable ground states, which underlie a series of unique physical phenomena and quantum states, including quantum criticality, topological Kondo insulators, and diverse charge-neutral quasiparticle formations. However, despite their importance, the nature of such composite quasiparticles is difficult to characterize because all coherent spectral features develop in a similar way. Using angle-resolved photoemission spectroscopy (ARPES) together with time-resolved PES, we have addressed distinct coherent 4f features in unique mixed-valence TmSe_1−xTe_x. Our findings open the path for future investigations of small energy-scale excitations and may provide a framework for understanding the dynamics and entangled nature of correlated electrons.