SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: PhD Focus Session: Non-equilibrium dynamics in theory and experiment
MA 30.3: Hauptvortrag
Mittwoch, 29. März 2023, 16:15–16:45, HSZ 02
Yep, real photodoping. — Lukas Gierster1,2 and •Julia Stähler1,2 — 1Humboldt-Universität zu Berlin, Inst. f. Chemie, Berlin, Germany — 2Fritz-Haber-Institut der MPG, Abt. PChem, Berlin, Germany
The advent of photoinduced phase transitions and the investigation of their non-equilibrium dynamics on ultrafast timescales coined various fashionable terms like hidden phases, new phases of matter, or photodoping. They were not always used rigorously and partially developed a life on their own. For instance, a photoexcited solid is not necessarily in a different phase just because it shows different properties than in its ground state - and the pure redistribution of charges after photoexcitation is not equivalent with chemical doping even if the photoexcitation drives a phase transition.
I will discuss these subtle, but important differences using the example of ZnO that undergoes a semiconductor-to-metal transition upon real photodoping at very low excitation densities [1]. Notably, the hidden, metallic phase has no equivalent in the equilibrium phase diagram and shows decay dynamics on ultrafast timescales, but can also be retained and become metastable [2].
[1] Nat. Commun. 12 978 (2021)
[2] Faraday Disc. (2022) DOI:10.1039/D2FD00036A