Publication

Experimental Specialization Semester in Resonant Inelastic X-Ray Scattering on Quantum Materials

2026

Abstract

This report is a summary of the physical background and experimental work conducted during the MA3 specialization semester in the autumn semester 2025/2026, focusing on Resonant Inelastic X-ray Scattering (RIXS). Two RIXS experiments on different quantum materials are performed and analyzed. The first study investigates the excitonic insulator candidate GdGaI and its temperature-dependent electronic excitations, aiming to probe potential excitonic signatures. Atomic multiplet calculations were performed to understand the experimental RIXS results. The second study focuses on Sr-doped La3Ni2O7 thin films, where RIXS is used to examine the doping dependence of magnetic and orbital excitations and their connection to superconductivity.

Official source

https://infoscience.epfl.ch/entities/publication/70d27427-0fc0-4245-940f-bdac63d759ec

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/70d27427-0fc0-4245-940f-bdac63d759ec

About this result

Related concepts (32)

Excited state

In quantum mechanics, an excited state of a system (such as an atom, molecule or nucleus) is any quantum state of the system that has a higher energy than the ground state (that is, more energy than the absolute minimum). Excitation refers to an increase in energy level above a chosen starting point, usually the ground state, but sometimes an already excited state. The temperature of a group of particles is indicative of the level of excitation (with the notable exception of systems that exhibit negative temperature).

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

Work function

In solid-state physics, the work function (sometimes spelt workfunction) is the minimum thermodynamic work (i.e., energy) needed to remove an electron from a solid to a point in the vacuum immediately outside the solid surface. Here "immediately" means that the final electron position is far from the surface on the atomic scale, but still too close to the solid to be influenced by ambient electric fields in the vacuum. The work function is not a characteristic of a bulk material, but rather a property of the surface of the material (depending on crystal face and contamination).

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Experimental Specialization Semester in Resonant Inelastic X-Ray Scattering on Quantum Materials

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