Zeit, Ort:

09:30 Uhr, Central Seminar Room, library building

Redner:

Patrick Friebel, Ultrafast Liquid Crystal Dynamics

Titel:

THz vibrational dynamics of Liquid Crystals: from molecular origin to bulk response

Zeit, Ort:

11:15 Uhr, Central seminar room, library building

Redner:

Birgit Stiller, Max Planck Institute for the Science of Light

Titel:

Sounds waves harnessing optical quantum technologies and photonic machine learning

Photonics has the potential to advance modern quantum technologies and high-speed applications such as communications and the processing of large amounts of data. However, to replace or improve the well-established systems with photonic solutions, there is still a way to go. A promising approach to manipulate light all-optically is to use the link of optical waves with acoustic vibrations. Our research experimentally investigates how traveling sound waves can be used to process states of light in the classical and quantum regime. With the help of acoustic waves, we implement several building blocks and operators for photonic machine learning, such as an optoacoustic recurrent operator and a photonic activation function for all-optical neural networks. We demonstrate non-reciprocal processing of polarization and orbital angular momentum states and show how photon-phonon entanglement and phonon cooling via stimulated Brillouin scattering is implemented in continuum systems like waveguides and optical fibers.

Zeit, Ort:

11:15 Uhr, Grosser Hoersaal/Big Lecture Hall (library)

Redner:

Prof. Dr. Thorsten Schumm

Titel:

Optical Mössbauer spectroscopy of Th-229 in CaF crystals

The recent precision VUV laser spectroscopy of Thorium-229 doped into calcium fluoride single crystals allows to probe nuclear properties and host material parameters with unprecedented accuracy. In this talk I will resume our current understanding of the microscopic doping structure, combining theoretical modelling, solid-state techniques like XAFS and RBS, and precision laser spectroscopy. We also report quenching of the thorium-229 isomer population under X-ray and laser illumination in the VUV, UV and optical range, hinting towards strong and controllable coupling of nuclear and solid-state degrees of freedom.

Zeit, Ort:

13:30 Uhr, Zentraler Seminarraum / Central seminar room (library)

Redner:

Prof. Dr. Thorsten Schumm

Titel:

Coffee break and Q&A session with Thorsten Schumm for young scientists

Zeit, Ort:

10:30 Uhr, Zentraler Seminarraum / Central seminar room (library building)

Redner:

Dr. Alex Kim (Lawrence Berkeley National Laboratory, USA, CA)

Titel:

Measuring type Ia supernova angular-diameter distances with intensity interferometry

Abstract: Intensity interferometry, based on the Hanbury Brown-Twiss effect, has the potential to measure supernova sizes and distances. With optimized telescope positioning, observing strategy, and advancements in single-photon detection technology, this method can provide precise angular size measurements of supernovae with apparent magnitudes as bright as 12~mag. For type~Ia supernovae, this limiting brightness corresponds to a local volume extending to redshift z ~0.004 and an anticipated discovery rate of approximately 1 event per year. The combination of angular size data with known physical dimensions enables accurate distance determination. As type Ia supernovae serve as standardizable candles for measuring the Universe's expansion history, combining intensity interferometry distances with the supernova Hubble diagram facilitates measurements of the Hubble constant I will also briefly discuss recent BAO measurements by the DESI collaboration, the connection with Type Ia supernovae, and peculiar velocities.

Zeit, Ort:

11:15 Uhr, Seminar room 242, Bothe Lab

Redner:

Zewen Sun, MPIK

Titel:

Reevaluating Pb-208 Nuclear Charge Radius

Zeit, Ort:

09:30 Uhr, Zentraler Seminarraum / Central seminar room (library)

Redner:

Pankaj Seliya; Excited atoms & molecules in strong fields

Titel:

Two-Dimensional Terahertz-Infrared-Visible Spectroscopy of Molecular C-H groups

Zeit, Ort:

15:00 Uhr, Central seminar room, library building

Redner:

Daniel Lange, CERN/MPIK

Titel:

ISOLTRAP Advances in Ion Purification: First Application of a Novel Mass-Selective Re-Trapping Technique and Recent Results

Hybrid seminar: central seminar room, library building + Zoom: Meeting-ID: 915 1204 2752 Passcode: 758933