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Prof. Stephan Götzinger

  • Professor
  • Room: A.3.230
  • Telephone: +49 9131 7133315
  • E-mail

My research is focused on solid-state quantum optics. In the past few years I have, for example, investigated methods to collect single photons with near-unity efficiency. Another emphasis is on techniques which can be used to enhance the interaction of a single photon with a single emitter.

2025

Nano-electronvolt Fourier-limited transition of a single surface-adsorbed molecule

Masoud Mirzaei, Alexey Shkarin, Burak Gurlek, Johannes Zirkelbach, Ashley J. Shin, Irena Deperasińska, Boleslaw Kozankiewicz, Tobias Utikal, Stephan Götzinger, et al.

arXiv 2510.14999 (2025) | Preprint | PDF

High-resolution spectroscopy allows one to probe weak interactions and to detect subtle phenomena. While such measurements are routinely performed on atoms and molecules in the gas phase, spectroscopy of adsorbed species on surfaces is faced with challenges. As a result, previous studies of surface-adsorbed molecules have fallen short of the ultimate resolution, where the transition linewidth is determined by the lifetime of the excited state. In this work, we conceive a new approach to surface deposition and report on Fourier-limited electronic transitions in single dibenzoterrylenes adsorbed onto the surface of an anthracene crystal. By performing spectroscopy and super-resolution microscopy at liquid helium temperature, we shed light on various properties of the adsorbed molecules. Our experimental results pave the way for a new class of experiments in surface science, where high spatial and spectral resolution can be combined.

Hybridization of molecules via a common photonic mode

Jahangir Nobakht, André Pscherer, Jan Renger, Stephan Götzinger, Vahid Sandoghdar

Proceedings of the National Academy of Sciences of the United States of America 122 e2505161122 (2025) | Journal | PDF

Atoms and molecules usually hybridize and form bonds when they come in very close<br>proximity of each other. In this work, we show that molecules can hybridize even<br>through far-field electromagnetic interactions mediated by the shared mode of an<br>optical microcavity. We discuss a collective enhancement of the vacuum Rabi splitting<br>and study super- and subradiant states that arise from the cavity-mediated coupling<br>both in the resonant and dispersive regimes. Moreover, we demonstrate a two-photon<br>transition that emerges between the ground and excited states of the new optical<br>compound. Our experimental data are in excellent agreement with the predictions<br>of the Tavis–Cummings Hamiltonian and open the door to the realization of hybrid<br>light–matter materials.

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