Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 40: Thermal, acoustic and transport properties
HL 40.6: Talk
Wednesday, March 18, 2020, 10:45–11:00, POT 151
Photo-induced metal-insulator transition in Cu(d6-DCNQI)2 single crystals — •Lisa Schraut-May1, Sebastian Hammer1, Florian Hüwe1, and Jens Pflaum1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
Low dimensional organic metals based on radical anion salts offer a wide range of exciting electronic as well as photo-physical phenomena. For instance, dicyanoquinonediimine (DCNQI) coordinated by metal atoms forms a complex showing a pronounced metal-insulator transition from the quasi-1D metallic ground state to the Peierls insulating state upon cooling. This transition is accompanied by a conductivity change of up to seven orders of magnitude [1]. By photo-exciting the insulating phase, a reverse Peierls transition occurs back to the metallic state followed by a lattice rearrangement on picosecond time scale [2]. We characterize this photo-induced switching in Cu(d6-DCNQI)2 single crystals by transient conductivity measurements as function of temperature and light intensity. The underlying mechanisms governing the dynamics of the reverse Peierls transition are characterized by a preliminary phenomenological model based on various decay processes for the excess energy upon photo-excitation. Finally, we will evaluate the potential of this material class for application as ultra-fast photo-switches.
[1] F. Karutz, et al., Phys. Rev. Lett. 81 (1998) 140
[2] B. Smit, et al., Adv. Mater. 31 (2019) 1900652