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O: Fachverband Oberflächenphysik
O 43: Scanning probe microscopy: light matter interaction at atomic scales – Poster
O 43.13: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Addressing Atomic-scale optical Stark-shift Microscopy — Xabier Arrieta1,2, Sofia Canola3, Ruben Esteban1,4, Javier Aizpurua2,4,5, and •Tomas Neuman3 — 1Centro de Física de Materiales (CFM-MPC), CSIC-UPV/EHU, Donostia- San Sebastián 20018, Spain — 2Department of Electricity and Electronics, FCT-ZTF, UPV/EHU, Leioa 48940, Spain — 3Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, Prague, 16200, Czech Republic — 4Donostia International Physics Center, Donostia-San Sebastián 20018, Spain — 5IKERBASQUE, Basque Foundation for Science, Euskadi Plaza 5, Bilbao 48009, Spain
An applied external electric field can shift the optical transition energies of molecular emitters through the optical DC Stark effect. Conventional Stark-shift spectroscopy applies spatially homogeneous electric fields, allowing to probe variations in molecular dipole moment and polarizability upon photoexcitation. In contrast, molecules in natural environments experience strongly inhomogeneous internal electric fields, where the Stark effect follows different selection rules. We extend the theory of Stark-shift spectroscopy to account for such nanoscale field. Similar field localization naturally arises in light-assisted scanning tunneling microscopy, which could provide spatially resolved access to the electronic response of individual molecules under optical excitation [1,2]. We demonstrate the potential of this technique to develop into atomic-scale Stark-shift microscopy. [1] Roslawska et al., Phys. Rev. X, 12, 011012 (2022). [2] Imada et al., Science, 373(6550), 95-98 (2021).
Keywords: Scanning tunneling microscopy; Optical Stark effect; Light-matter interaction