Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale II

O 43.5: Talk

Tuesday, March 18, 2025, 15:00–15:15, H24

Correlations between noise and electroluminescence in graphene nanojunctions — •Sascha Korn, Michael Krieger, and Heiko B. Weber — Lehrstuhl für Angewandte Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg

Light emission in scanning tunneling microscopy is often explained by the granularity of charge and should be therefore correlated with shot noise. Also, hot electrons may create both noise and thermal luminescence [1,2]. Using planar graphene nanojunctions, we study the phenomenon of electroluminescence in the point contact regime in a simple and well controlled electromagnetic environment. A spectral analysis of such measurements perfectly follows Planck`s law and unambiguously supports the thermal picture. We present experimental data that correlate electrical noise measurements and optical spectroscopy, providing an in-depth view into the microscopic processes.

[1] Ott, C., Götzinger, S. & Weber, H. B. Thermal origin of light emission in nonresonant and resonant nanojunctions. Phys. Rev. Res. 2, 042019 (2020)

[2] Korn, S., Popp, M.A. & Weber, H.B. A point-like thermal light source as a probe for sensing light-matter interaction. Sci Rep 12, 4881 (2022)

Keywords: Electroluminescence; Electrical noise; Nanojunctions