We plan to return partly to in-person talks. These talks will be held in the interim lecture hall B 0.32 at MPQ and can additionally be attended online. Some talks remain online only.
2G regulations apply to in-person talks, i.e. every time you wish to participate in person, you will have to prove, e.g. with the CovPass-App, that you are vaccinated or recovered.Whether facemasks have to be worn inside the lecture hall will be communicated in the the e-mail announcement for each talk separately. In any case, you will need a medical facemask in the hallway. Audience not affiliated with MPQ are welcome to join in person as long as they meet 2G criteria.
Details on how to participate online are distributed via the mailing lists [wiss-mpq] and [Mpq-colloquium-stream]. To receive this information, please register using the adjacent link.
Scientific organization of the talks: Dr. Stephan Dürr and Dr. Thomas Udem
Combined optical nonlinearity of bound and free electrons in a fast-ionizing medium driven by ultrashort, high-peak-power mid-infrared (mid-IR) pulses gives rise to a vast variety of ultrafast nonlinear-optical scenarios, producing bright and remarkably broadband radiation in spectral ranges as different as ultraviolet (UV), terahertz (THz), and microwave frequency bands. Given its enormous bandwidth, a quantitative experimental analysis of this type of nonlinear response is anything but simple.
Entangled states of many particles can be used to overcome limits on measurements performed with ensembles of independent atoms (standard quantum limit). A particularly simple form of entanglement is spin squeezing, where the quantum noise for the variable of interest, e.g., the phase of an atomic clock, is redistributed into another variable.
Helium is the only element that remains liquid under normal pressure down to zero temperature. Below 2.17K, bulk helium-4 is superfluid. Motivated by this intriguing behavior, the properties of finite-sized helium droplets have been studied extensively over the past 30 years or so. Some properties of liquid helium-4 droplets are, just as those of nuclei, well described by the liquid drop model. The existence of the extremely fragile helium dimer was proven experimentally in 1994 in diffraction grating experiments.
In this talk I will give an overview of the novel field of topological photonics. This field merges platforms and techniques from AMO physics with ideas from topological states of matter so to enlarge the functionalities of photonic devices and explore new topological effects in wave mechanics and quantum many-body physics.