Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Poster Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale

O 20.5: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Plasmonic STM-luminescence driven by a high-power spintronic THz emitter — •Alkisti Vaitsi, Luis Enrique Parra López, Vivien Sleziona, Martin Wolf, and Melanie Müller — Fritz Haber Institute of the Max Planck Society, Berlin, Germany

We demonstrate THz-induced STM-luminescence (THz-STML) from a plasmonic tunnel junction driven by broadband single-cycle THz pulses generated from a high-power rotating spintronic THz emitter (STE). By measuring the dependence of the plasmonic luminescence on the static STM bias and the THz-STM bias, we aim for a purely data-driven approach to calibrate the THz peak bias via reconstruction of the THz-STML spectra from the static reference STML spectra. Our results proof the capability of the rotating STE to generate several Volts peak THz bias in a metallic STM junction and pave the way for future time-resolved gating of STM-luminescence from excitonic quantum emitters.

[1] Kimura et al., ACS Photonics 8, 4, 982-987 (2021)

[2] Vaitsi et al., Appl. Phys. Lett. 125, 071107 (2024)

Keywords: THz scanning tunneling microscopy; Plasmonic luminescence; Nanospectroscopy; Spintronic THz emitter