Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 91: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales III

O 91.7: Vortrag

Donnerstag, 21. März 2024, 16:45–17:00, MA 041

Electrically driven cascaded photon-emission in a single molecule — •Katharina Kaiser^{1, 2}, Anna Rosławska^{1, 3}, Michelangelo Romeo¹, Fabrice Scheurer¹, Tomáš Neuman⁴, and Guillaume Schull¹ — ¹CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, France — ²IV. Physikalisches Institut, Georg-August-Universität Göttingen, Germany — ³MPI für Festkörperforschung, Stuttgart, Germany — ⁴Institute of Physics of the Czech Academy of Sciences, Prague, Czechia

In STM-induced luminescence (STML) of single molecules, the intricate interplay between charging dynamics and excited state formation and decay can be accessed by studying correlations between consecutively emitted photons. This not only provides access to the time constants of the processes involved, but also sheds light on the quantum mechanical nature of a single molecule emitter. Until now, such studies were mainly focused on one transition only. For molecules adsorbed on thin insulating films, however, there are many accessible states, depending on the STM setpoint. Taking advantage of this, we investigate the interplay between the exciton and trion formation and decay in individual ZnPc molecules. We show that, upon trion formation, we can drive the correlated emission of photons from two different excited states within one molecule. In addition, by tuning the rate at which the molecule is charged we can control the population dynamics of the states involved. This allows us to disentangle which states play a role in the formation of excited states in a molecule in STML, and provides a direct means to manipulate excited state dynamics.

Keywords: Scanning tunneling microscopy induced luminescence; Hanbury Brown-Twiss interferometry; Correlations