Dr. Fabian Mooshammer has received the "Kulturpreis Bayern" for his PhD Thesis "Multi-terahertz nanotomography of van der Waals quantum materials". The prize honours people who enrich our society with their commitment, their work and their enthusiasm for art, culture and science.... more
Together with the groups of Klaus Richter (UR), Ferdinand Evers (UR), Ulrich Höfer (University of Marburg) and collaborators from the Novosibirsk State University, we discovered a novel generation mechanism of high-order harmonics in the surface state of a topological insulator. When quasi-relativistic electrons are accelerated through the Dirac point by an intense lightwave, they abruptly reverse their velocity allowing for purely non-integer high-harmonic generation. The lightwave-driven currents reveal intriguing aspects of the quantum mechanical nature of electrons in topological matter.
Press release (idw) in German
Press release (idw) in English
The results have been published in Nature....
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In collaboration with the group of Jaroslav Fabian (UR) and together with Tyler Cocker and Jessica Boland, we implemented a novel concept to map out ultrafast interlayer tunneling and recombination dynamics of excitons in van der Waals heterostructures in a contact-free manner. The new technique provides spatiotemporal access to tunnelling processes in insulating, conducting, or superconducting systems, on nanometer length and femtosecond time scales, conceptually bridging the gap between near-field microscopy and light-wave driven STM.
Press release (idw) in German
Press release (idw) in English
The results have been published in Nature Photonics. ...
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Fabian Mooshammer received the PhD award by the German terahertz center (Deutsches Terahertzzentrum e.V.) for his thesis "Multi-terahertz nanotomography of van der Waals quantum materials". The biennial award was conferred in the annual meeting on May 7.... more
Together with the groups of Dominique Bougeard (UR) and Cristiano Ciuti (Université de Paris), we explored a novel regime of light-matter interaction, where both the Rabi frequency induced by a coherent driving field and the vacuum Rabi frequency set by a cavity field are comparable to the carrier frequency of light. The resulting subcycle nonlinearities may facilitate novel nonclassical light sources, quantum phase transitions, or cavity chemistry with virtual photons.
The results have been published in Physical Review Letters. ...
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We are pleased to announce the launch of our new RUN website: https://www.run-regensburg.com/
The new website offers quick and easy access to essential information on the RUN, dates, availability, press releases, construction progress, publications, and open positions.
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In a collaboration with the group of Ermin Malic (University of Marburg), we demonstrated proximity-controlled strong-coupling between phonons and electrically neutral excitons at atomically sharp interfaces of WSe2/gypsum heterostructures, creating new exciton-phonon mixed eigenmodes, called excitonic Lyman polarons. These findings could enable new man-made phase transitions in artificially stacked materials.
Press release (idw) in German
Press release (idw) in English
Press release (Science X) in English
The results have been published in Nature Communications and are featured in the Editors' Highlights....
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The new career guide Research in Bavaria features job opportunities and stories on pioneering research at the University of Regensburg. Meet our researchers and learn more about your career opportunities at the University of Regensburg.
See also the feature article on our group The Quantum World in Motion....
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Together with our long-term collaborators Mack Kira (University of Michigan, Ann Arbor) and Stephan W. Koch (Philipps Universität Marburg), we have developed an all-optical way of mapping out electronic band structures of even tiny flakes of quantum materials in ambient air. Our approach uses a new concept called momentum combs to achieve super-resolution, which could help us to tailor emerging quantum materials and pave the way for advanced energy technologies and quantum computers.
Press release (idw) in English
Press release (idw) in German
The results have been published in Science....
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In close collaboration with the groups of Jascha Repp (UR) and Angel Rubio (Max Planck Institute for the Structure and Dynamics of Matter, Hamburg), we found a way to map out atom-scale lightwave dynamics. Using a single-molecule switch, which senses changes in the local electromagnetic fields, we were able to quantitatively detect atom-scale near-field waveforms in the junction of a scanning tunneling microscope.
Press release (idw) in English
The results are reported in Nature Photonics and are featured in a News and Views article by Jun Takeda and Ikufumi Katayama. ...
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Together with our collaborators from Jascha Repp's group and Nikolaj Moll, we have found a fascinating way to push a select atom with controlled forces so quickly that we can choreograph the motion of a single molecule within less than a trillionth of a second.
The results have been published in Nature....
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Together with the groups of Prof. Dr. Miriam S. Vitiello (Pisa) and Prof. Dr. Edmund Linfield (Leeds) we developed a new group of saturable absorbers in the terahertz spectral domain based on ultra-strong coupling of intersubband transitions to the resonant mode of a microresonator. These new devices could enable passive mode locking of future quantum cascade lasers.
Press release (idw) in English
The results have been published in Nature Communications....
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In close collaboration with the group of Dominique Bougeard and with Cristiano Ciuti (Université de Paris), we managed to switch off deep-strong light-matter coupling much faster than a cycle of light. Our breakthrough provides a very unusual glimpse behind the virtual photon dress of electrons, which helps unravelling the nature of vacuum fluctuations. In the future, even chemical reactions or superconductivity may be triggered merely by abrupt modification of the quantum vacuum.
The results are reported in Nature Photonics....
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In a collaboration with the groups of Ermin Malic, John Lupton, and Janina Maultzsch, we resolved the internal atom-like structure of excitons in a stack of two atomically thin monolayers of WSe2. Merely by changing the stacking angle, we find a drastic renormalization of the binding energy and lifetime as well as a highly tunable exciton-exciton interaction. These results pave the way for tailoring novel phases of matter in a broad range of van der Waals heterostructures.
Press release (idw) in German
These results have been published in Nature Communications....
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Congratulations to Christoph Lange who has just started a new chair entitled "THz spectroscopy" at the Technische Universität Dortmund, beginning April 1, 2020. In his new group, Christoph will pursue new directions of THz cavity quantum electrodynamics on the subcycle scale. We wish him all the best for a successful start and look forward to continuing our successful collaboration!... more
Markus Huber - 15.02.2023 12:25 
June 2024
Coverstory in Nature Photon.
May 2024
Publication in Nature
July 2023
Launch of the ERC project Orbital Cinema
April 2023
Publication in Nature
October 2022
Publication in Nature
August 2021
Coverstory in Nature Photon.
May 2021
Publication in Nature
December 4, 2020
Publication in Science
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