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O: Fachverband Oberflächenphysik

O 85: Vacuum Science & Technology: Theory and Applications II

O 85.3: Vortrag

Donnerstag, 12. März 2026, 15:45–16:00, HSZ/0401

A new framework for analysing transport ARPES applied to the current induced insulator to metal transition in Ca₂RuO₄. — •Anders Sandermann Mortensen, Hippolyte Raymond Bourel, Katarina Ogliara Praest, Davide Curcio, and Philip Hofmann — Institute of Physics and Astronomy, Aarhus University

The advent of µm-resolution spatially resolved ARPES-measurements allows for in-operando measurements of modifications to the electronic band structure of electrical devices (transport-ARPES). However, this technique poses a new set of challenges, as local biasing of the samples results in systematic shifts of the measured energy, hindering direct comparison of ARPES spectra.

Here, we propose a novel solution to this problem: Realigning the spectra by minimizing the L1-norm between them. Combined with k-means clustering, this provides an effective framework for real-time analysis and characterisation of transport-ARPES measurements.

As a proof of concept, we apply our analysis scheme to transport-ARPES measurements of the current-induced insulator to metal transition in Ca₂RuO₄, and thus provide new, high statistics measurements of the changes to the electronic band structure during the current-induced insulator to metal transition.

Keywords: ARPES; transport-ARPES; k-means clustering; machine learning; Mott insulator