Robert Weis

Kirchhoff Institute for Physics

The Kirchhoff Institute for Physics (KIP) is named after a prominent physicist of the 19th Century: Gustav Robert Kirchhoff, who worked in Heidelberg for 21 years. His well-known lectures on experimental and theoretical physics attracted many students. Kirchhoff's ground-breaking research was extraordinarily diverse, spanning electrical, magnetic, optical, elastic, hydrodynamic and thermal processes. His laws for electrical circuits are well-known. At the time he was in Heidelberg, in conjunction with Robert Wilhelm Bunsen, he discovered spectral analysis and its application to solar radiation. In this way, Kirchhoff laid the foundation for modern astrophysics, as well as formulating the laws of thermal radiation, which played a key role in the discovery of quantum physics. The KIP aims to continue in this tradition of diverse scientific research and education.

Physikalisches Kolloquium

24. October 2025 5:00 pm  Jets, Bubbles, Spikes, and Breakups: How Ice Spreads in Clouds

Prof. Dr. Thomas Leisner, Institut für Umweltphysik, Universität Heidelberg,Aerosols are small airborne particles that are surrounding us but are mostly invisible to our eyes. Multiple natural and anthropogenic emission sources lead to various chemical compositions of aerosols in the Earth's atmosphere. Influences of aerosols on radiative transfer and cloud microphysical processes are qualitatively understood, but the magnitudes of these effects are under debate with important implication for understanding past and future climate change. In this colloquium, I will give a glimpse on aerosol effects on climate, explain some reasons for uncertainties in our understanding of their effects on climate, and outline how we can make progress despite persistent model uncertainty.more...

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Spin waves in a 2D quantum magnet

Why do two-dimensional magnetic materials show quantum critical behavior?

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