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How electrons dress up in light

In close collaboration with the group of Ulrich Höfer (University of Marburg), we observed the ultrafast birth, rise, and collapse of a Floquet-Bloch band structure, for the first time. Angle-resolved photoemission spectroscopy combined with atomically strong light fields revealed that Floquet-Bloch bands form already after a single optical cycle and play an intriguing role in high-harmonic generation. These surprising findings pave the way to tailored quantum functionalities and ultrafast electronics. Theoretical modeling by Michael Schüler (Paul Scherrer Institute, Villigen) and Michael Sentef (MPI Hamburg) convincingly supported the conclusions.

The results have been published in Nature.
... more


Svenja Nerreter selected as 2023 Optica Women Scholar

We are thrilled to announce that Svenja Nerreter has been selected as an Optica Women Scholar 2023.

This exceptional award recognizes outstanding Bachelor's and Master's students in the field of optics and photonics, and comes with a grant of $10,000 and access to a valuable mentoring platform.

Congratulations, Svenja!

Press release (UR) in German
... more


Best Lecture Award

Our lecture on Light Matter Interaction was awarded with the Best Lecture Award of the Faculty of Physics. Image (from left to right, top): Manuel Meierhofer, Lukas Kastner, Rupert Huber (professor), Markus Huber, Martin Zizlsperger, Simon Maier, (bottom:) Johannes Hayes, Marlene Liebich... more


New website of the ERC Synergy grant "Orbital Cinema"

Directly watching in slow-motion videos how electrons move in quantum mechanical orbitals and how this motion shapes the functionalities of condensed matter has been a dream shared by all natural and life sciences. Yet, this vision comes with the daunting challenge of mapping the microscopic structure of electronic orbitals with simultaneous ultrafast time resolution.

We will turn orbital cinematography into reality.

Read more on https://orbital-cinema.eu/.... more


Vacant position for Master or PhD research in lightwave-driven tunnelling microscopy

Would you like to delve into the nanocosm and use state-of-the-art ultrafast nanoscopy techniques to investigate the inner workings of matter? What if you could even do that simultaneously at Angström spatial and femtosecond temporal scales?

Our group has vacant positions for young scientists at the Master's and PhD level to join us in cutting edge research and measurement techniques, opening the doors to solving fundamental and previously untouchable fields in nanoscale light-matter interaction, high-temperature super-conductivity, exciton dynamics and more.
Working closely with colleagues from both scanning tunnelling microscopy and ultrafast optics, your tasks would include design, setup and operation of nanoscopy equipment as well as analysis and modelling of the results with the focus depending on your individual preferences.

You are highly motivated, have a physics background and want to work in a stimulating environment uncovering the mysteries of the nanoscopic world?

Get in touch with us.... more


"Nacht schafft Wissen!" in unseren FemtoLabs

Im Rahmen des regensburgweiten Events "Nacht schafft Wissen!" wurde Interessierten und Physikbegeisterten in Führungen durch unsere Kellerlabore Ultrakurzzeit- und Laserphysik an spannenden Vorführexperimenten nähergebracht.

https://www.uni-regensburg.de/veranstaltungen/nacht-schafft-wissen/einblicke-2022/index.html ... more


ERC Synergy Grant for “Orbital Cinema”

Together with our partners, Stefan Tautz from Jülich, Ulrich Höfer from Marburg, and Peter Puschnig from Graz, we have been awarded an ERC Synergy Grant worth 11.3 million €. In a close collaboration of our groups we will take actual slow-motion movies of molecular orbitals during charge transfer processes, chemical reactions, and wave packet motion driven by lightwaves.

Press release (idw) in German.... more


Attosecond clocking of Bloch electrons

Together with the group of Mackillo Kira (Michigan), we use multi-terahertz light fields to force electron-hole pairs in semiconductors onto closed recollision paths. Attosecond clocking of these trajectories reveals how many-body correlations like strong Coulomb interactions modify the charge carrier dynamics. This novel concept offers a completely new access to exotic phase transitions and quantum dynamics important for future electronic and quantum-information technologies.

The results have been published in Nature.... more


Joshua Mornhinweg receives IRMMW-THz 2022 best student paper award

We congratulate Joshua Mornhinweg on winning the first prize of the best student paper award of the 2022 International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) in Delft with his talk titled nonlinear subcycle dynamics of ultrastrong light-matter interaction. The prize honours original contributions to the conference from outstanding student attendees.... more


TU Delft, Netherlands


Best Lecture Award

Our lecture on physics of atoms and molecules was awarded with the Best Lecture Award of the Faculty of Physics.

Image (from left to right): Manuel Meierhofer, Martin Zizlsperger, Felix Schiegl, Rupert Huber (professor), Christian Meineke, Johannes Hayes, Marlene Liebich
Missing: Lukas Kastner... more


Intersubband Polariton-Polariton Scattering

We studied the ultrafast dynamics of intersubband polaritons in the mid-infrared together with the groups of Raffaele Colombelli (Paris), Christoph Lange (Dortmund) and Iacopo Carusotto (Trento). Stimulated scattering occurs between these polaritons for resonant excitation, which we observe directly within the polaritonic bandstructure. This scattering mechanism could enable Bose-Einstein-condensates of intersubband polaritons for novel quantum computers and on-chip mid-infrared light sources.

The results have been published in Physical Review Letters.... more


Light-field-driven tunneling currents in a Schottky diode

In collaboration with the group of Heiko Weber (Friedrich-Alexander-Universität Erlangen-Nürnberg) we investigated mid-infrared light-field-driven tunneling currents in a Schottky diode, consisting of epitaxial graphene on silicon carbide. Our study gives insights into the intrinsic speed limits of rectification currents in these devices and paves the way towards light-field-driven electronics with increased functionality, such as transistors and logic circuits.

Press release (UR) in German

The results have been published in Science Advances.... more


Generating intense sub-half-cycle terahertz pulses

We developed a novel, flexible and scalable emitter of extremely asymmetric and intense terahertz field transients together with the groups of Dominique Bougeard (UR) and Mackillo Kira (University of Michigan) as well as collaborators from the Helmut Schmidt University and the Justus Liebig University Gießen. Making use of shift currents and local charging dynamics in asymmetrically coupled epitaxial semiconductor heterostructures, we generated waveforms exhibiting less than an oscillation half-cycle, peak fields above 1.1 kV cm-1 and spectra spanning into the mid-infrared, marking a milestone for next-generation high-repetition-rate (multi-)terahertz sources.

Press release (University of Michigan) in English
Press release (Mirage) in English
Press release (Laser Focus World) in English

The results have been published in Light: Science & Applications.... more


Martin Zizlsperger receives Maiman Student Paper Award

We congratulate Martin Zizlsperger on winning the 2022 Maiman Student Paper Award, one of the most prestigious and honoured student awards in optics and photonics worldwide.

Press release (UR) in German.
... more


Resolving the exciton Mott transition on the nanoscale

In collaboration with the group of Ermin Malic (University of Marburg), we used ultrafast near-field microscopy to study the Mott transition of strongly-bound excitons in an atomically thin heterostructure of WSe2, unveiling pronounced nanoscale modulation in the dynamics of the transition. These findings underscore how nanoscale disorder plays a pivotal role in the dynamics of many-body phase transitions within a broad range of van der Waals materials.

The results have been published in Nano Letters. ... more


July 2023
Launch of the ERC project Orbital Cinema