Physics

Researchers at ETH Zurich have succeeded for the first time in trapping excitons - quasiparticles consisting of negatively charged electrons and positively charged holes – in a semiconductor material using controllable electric fields. The new technique is important for creating single photon sources as well as for basic research.  

Physicists at EPFL, within a large European collaboration, have revised one of the fundamental laws that has been foundational to plasma and fusion research for over three decades, even governing the design of megaprojects like ITER. The update shows that we can actually safely use more hydrogen fuel in fusion reactors, and therefore obtain more energy than previously thought.

Under the name SLS 2.0, the multi-year project to upgrade the Swiss Light Source SLS is currently under way. From 2025 on, the large research facility SLS will provide research with even more intense X-ray light than before. The first special magnets, which are crucial for achieving this, have now arrived. In addition, the Canton of Aargau has released 9.75 million Swiss francs for the budget.

Matthias Saurer is a physicist and heads the WSL isotope laboratory where complex measuring procedures are used to determine plants’ isotope ratios. These provide answers to questions about the nutrient and water balance in forests, for example, and provide important foundations for environmental and climate research.

Aerosols in the atmosphere react to incident sunlight. This light is amplified in the interior of the aerosol droplets and particles, accelerating reactions. ETH researchers have now been able to demonstrate and quantify this effect and recommend factoring it into future climate models.