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

3. February 2023 5:00 pm  Towards a SiGe-based laser

Prof. Dr. Erik Bakkers, Department of Applied Physics, University of Technology, Eindhoven, he performance of electronic chips is to a large extent limited by the electrical resistance, which sets the maximum operation frequency and the minimum power consumption. It is expected that by replacing part of the electronic circuit by photonics, these limitations could be alleviated. For this goal, an integrated light source is required. more...


CQD Colloquium (funded by STRUCTURES), Februrary 1, 5 p.m., Physikalisches Institut, INF 226, Room 00.101-00.103

Professor Dr. Florian Schreck, University of Amsterdam, Netherlands, about:

Continuous Bose-Einstein condensation and superradiant clocks

Ultracold quantum gases are excellent platforms for quantum simulation and sensing. So far these gases have been produced using time-sequential cooling stages and after creation they unfortunately decay through unavoidable loss processes. This limits what can be done with them. For example it becomes impossible to extract a continuous-wave atom laser, which has promising applications for precision measurement through atom interferometry. I will present how we achieve continuous Bose-Einstein condensation and create condensates (BECs)that persist in a steady-state for as long as we desire. Atom loss is compensated by feeding fresh atoms from a continuously replenished thermal source into the BEC by Bose-stimulated gain. Our experiment is the matter wave analog of a cw optical laser with fully reflective cavity mirrors. The only step missing to create acontinuous-wave atom laserbeamis the addition of a coherent atom outcoupling mechanism. In addition this BEC may give us access to interesting driven-dissipative quantum phenomena over unprecedented timescales. The techniques we developed to achieve the continuous source of thermal atoms are also nicely suited to tackle another challenge: the creation of a continuously operating superradiant clock. These clocks promise to become more rugged and/or more short-term stable than traditional optical clocks, thereby opening new application areas. In thesecond part of my talk I will present how we are developing two types of superradiant clocks within the European Quantum Flagship consortium iqClock.


The pretalk will be given by Karthik Chandrashekara, Physikalisches Institut, Universität Heidelberg: "Towards dipolar quantum gases in 2D – Current status and future prospects of the Heidelberg Dy experiment".

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Kirchhoff-Institute for Physics
Im Neuenheimer Feld 227
D-69120 Heidelberg

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