OSE Seminar by Dr. Jens Biegert on High Harmonic Spectroscopy: Probing Charge Density Waves and Quantum High Harmonics

Departmental News

Dr. Hermann Kahle

Posted: October 25, 2025

Date: Thursday, October 30, 2025

Time: 12:30 PM to 1:45 PM

Location: CHTM, 103 and Zoom

Speaker:Dr. Jens Biegert

UNM Alumnus
ICFO - The Institute of Photonic Sciences, Barcelona, Spain

 

Abstract:

High harmonic spectroscopy has emerged as a uniquely powerful tool to probe and control quantum materials on their natural attosecond–femtosecond timescales. In this talk, I will discuss recent advances that extend high harmonic generation from atoms and molecules to complex solids, enabling the direct observation of correlated electron dynamics in charge density wave systems. I will show how the high harmonic response encodes signatures of symmetry breaking, collective excitations, and ultrafast phase transitions. Finally, I will outline the emergence of quantum high harmonics, where the interplay of strong fields and quantum coherence opens a route to accessing and manipulating quasiparticle correlations in solids with unprecedented temporal and spectral resolution.


Biography:

Jens Biegert is ICREA Professor at ICFO and leads experimental research on Attoscience and Ultrafast Optics. Biegert received his PhD in Physics in 2001 from the Technische Universität München, based on work at the University of New Mexico in the USA under the supervision of Jean-Claude Diels. The topic of his PhD was the physics of multiphoton coherent excitation of atomic sodium, with applications for astronomical guidestars. After completing his PhD, he pursued his Habilitation to lead a group on attosecond science at ETH Zürich. Since 2007, at ICFO, he has pioneered mid-IR photonics, attosecond soft X-rays, and laser induced electron diffraction, leading to breakthroughs in imaging chemical dynamics and carrier motion in quantum materials. Currently, he coordinates a European Commission FET Consortium and participates in two additional FET consortia. Jens Biegert is a Guest Professor at the Fritz Haber Institute of the Max Planck Society in Berlin. For example, he is actively involved in the scientific community as a co-author of the white book with Gérard Mourou, which contributed to the development of the 1.2-billion-Euro European Extreme Light Infrastructure. He serves on the Board of Directors of OPTICA, is Chair of the Meetings Council, and is part of the Strategic Planning and Finance Councils. He previously served on the Board of Chairs of ARIE, the Analytical Research Infrastructures of Europe, which represents seven networks of European infrastructures involving 40,000 researchers. He led Europe’s foremost laser network, “Laserlab-Europe,” as its Executive Director, uniting 46 leading research infrastructures across 22 European countries. He is a Topical Editor of OPTICA and AAAS/CAS Ultrafast Science and is a Fellow of the Studienstiftung des deutschen Volkes, OPTICA, and the American Physical Society. He has received numerous awards, including the Thousand Talents Program Award of the People's Republic of China, the OSA Allen Prize, the Bessel Prize of the Humboldt Foundation, the ERC Advanced Grant, and the ERC Proof of Concept Grant.