Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Ultra-fast Phenomena I
HL 8.10: Vortrag
Montag, 9. März 2026, 17:30–17:45, POT/0006
Dynamic control of electron correlations in photodoped charge-transfer insulators — •Thomas C. Rossi1,2, Nicolas Tancogne-Dejean3, Malte Oppermann1,4, Michael Porer5, Arnaud Magrez6, Rajesh V. Chopdekar7, Yayoi Takamura7, Urs Staub5, Renske M. van der Veen2, Angel Rubio3,8, and Majed Chergui1,9 — 1LSU and LACUS, EPFL, Lausanne, Switzerland — 2PS-ADLU, HZB, Berlin, Germany — 3MPI for the Structure and Dynamics of Matter, Hamburg, Germany — 4Department of Chemistry, University of Basel, Switzerland — 5SLS, PSI, Villigen, Switzerland. — 6Crystal Growth Facility, EPFL, Lausanne, Switzerland — 7Department of Materials and Science Engineering, UC Davis, USA — 8ICC and CCQ, Simons Foundation Flatiron Institute, New York, USA — 9Elettra-Sincrotrone, Trieste, Italy
Tuning the electronic properties of materials is typically achieved by altering their chemical composition or thermodynamic parameters. An alternative route relies on ultrafast light excitation, which can create transient phases such as light-induced superconductivity and hidden insulator-to-metal transitions. In this talk, I will present evidence of light-driven dynamic screening of electron correlations in a prototypical charge-transfer insulator, nickel oxide (NiO). The excited state, characterized by weakened electron correlations, is metastable for hundreds of picoseconds. The high degree of control achieved over both the energetic and temporal aspects of electronic correlations offers a promising path toward full optical control of the electronic properties of correlated systems and the Mott transition.
Keywords: charge-transfer insulator; optical transient spectroscopy; Hubbard model; dynamic screening; nickel oxide