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Our Publications

Strain and Temperature Dependence of the Electronic Structure of Sr2RuO4 Investigated by ARPES
Andrew Scott Hunter

Thèse (2023)

In its normal state, Sr2RuO4 is a prototypical Fermi liquid below ∼ 25 K. At ∼ 1.5 K it undergoes a superconducting transition, but it has long remained challenging to determine the symmetry or order parameter of the superconducting state. Recent experiments have shown…

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Transfer learning application of self-supervised learning in ARPES
Sandy Adhitia Ekahana, Genta Indra Winata, Yeong-Ah Soh, Anna Tamai, Milan Radovic, Gabriel Aeppli and Ming Shi

Machine learning: science and technology (2023)

There is a growing recognition that electronic band structure is a local property of materials and devices, and there is steep growth in capabilities to collect the relevant data. New photon sources, from small-laboratory-based lasers to free electron lasers, together with focussing beam optics and …

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The fate of quasiparticles at high-temperature
Andrew Scott Hunter, S. Beck, Edoardo Cappelli, Florian Margot, Michael Straub, Yann Alexanian, Gianmarco Gatti, M. D. Watson, T. K. Kim, C. Cacho, N. C. Plumb, M. Shi, M. Radović, D. A. Sokolov, A. P. Mackenzie, M. Zingl, J. Mravlje, Antoine Georges, Felix Baumberger and Anna Tamai

Preprint (2023)

We study the temperature evolution of quasiparticles in the correlated metal Sr$_2$RuO$_4$. Our angle resolved photoemission data show that quasiparticles persist up to temperatures above 200~K, far beyond the Fermi liquid regime. Extracting the quasiparticle self-energy we demonstrate that the…

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Observation of flat Γ moiré bands in twisted bilayer WSe2
Gianmarco Gatti, Julia Issing, Louk Rademaker, Florian Margot, Tobias A. de Jong, Sense Jan van der Molen, Jérémie Teyssier, Timur K. Kim, Matthew D. Watson, Cephise Cacho, Pavel Dudin, José Avila, Kumara Cordero Edwards, Patrycja Paruch, Nicolas Ubrig, Ignacio Gutierrez Lezama, Alberto Morpurgo, Anna Tamai and Felix Baumberger

Physical review letters 131 4, 046401 (2023)

The recent observation of correlated phases in transition metal dichalcogenide moir\’e systems at integer and fractional filling promises new insight into metal-insulator transitions and the unusual states of matter that can emerge near such transitions. Here, we combine real- and momentum-space…

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Electronic structure of few-layer black phosphorus from μ-ARPES
Florian Margot, Simone Lisi, Irène Cucchi, Edoardo Cappelli, Andrew Scott Hunter, Ignacio Gutierrez Lezama, KeYuan Ma, Fabian von Rohr, Christophe Berthod, Francesco Petocchi, Samuel Poncé, Nicola Marzari, Marco Gibertini, Anna Tamai, Alberto Morpurgo and Felix Baumberger

Nano letters 23, 6433 (2023)

Black phosphorus (BP) stands out among two-dimensional (2D) semiconductors because of its high mobility and thickness dependent direct band gap. However, the quasiparticle band structure of ultrathin BP has remained inaccessible to experiment thus far. Here we use a recently developed laser-based…

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Electronic structure of exfoliated few-layer Black Phosphorus from micro-focus ARPES
Florian Margot

Thèse, 136 (2022)

2D semiconducting materials represent an interesting opportunity for the desired scaling of electronic devices. Black phosphorus (PB) is a promising candidate because of its direct gap in the range of telecommunications wavelengths and a comparatively high room-temperature mobility that compares…

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