Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Semiconductor Surfaces

O 30.5: Vortrag

Dienstag, 6. September 2022, 11:45–12:00, S053

Growth of well-ordered K3C60 thin films on Bi2Se3 — •Michael Herb and Isabella Gierz — Department of Physics, University of Regensburg, 93040 Regensburg, Germany

The molecular solid K3C60 is a BCS-type superconductor with a critical temperature of 20K [1]. More intriguingly, K3C60 powder exposed to strong mid-infrared driving fields exhibits the optical properties of a transient superconductor [2] possibly up to room temperature [3] and with nanosecond lifetimes [4]. The microscopic mechanism behind these observations remains poorly understood. We want to shed light onto this issue by measuring the transient band structure of driven K3C60 using time- and angle-resolved photoemission spectroscopy (tr-ARPES). These experiments cannot be performed on the originally used K3C60 powder as they require large, well-ordered K3C60 single crystals. Therefore, we investigate the growth of K3C60 thin films on different substrates using low-energy electron diffraction (LEED) and ultraviolet photoemission spectroscopy (UPS). We provide evidence for well-ordered growth on Bi2Se3, enabling future tr-ARPES studies on the material.