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MO: Fachverband Molekülphysik
MO 13: Poster – Ultrafast Electronic Dynamics
MO 13.2: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
ultrafast coherent dynamics in light-harvesting complexes from purple bacteria — •xinpeng xu1, paul recknagel1, alastair t. gardiner2, richard j. cogdell3, richard hildner4, and jürgen köhler1,5,6 — 1Spectroscopy of Soft Matter, University of Bayreuth, Bayreuth 95440, Germany — 2Institute of Microbiology of the Czech Academy of Sciences, Třeboň 379 01, Czech Republic — 3School of Molecular Biosciences, Glasgow University, Glasgow G12 8QQ, U.K. — 4Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 3, Groningen 9747 AG, The Netherlands — 5Bavarian Polymer Institute, University of Bayreuth, Bayreuth 95440, Germany — 6Bayreuther Institut für Makromolekülforschung (BIMF), Bayreuth 95440, Germany
Photosynthetic purple bacteria accomodate peripheral light-harvesting complexes, typically termed LH2, for capturing solar energy. The species Rps. acidophila features two different antenna complexes, i.e. the B800-B850 LH2 when grown under high-light conditions (HL LH2) and the B800-B820 LH2 when grown under low-light conditions (LL LH2). The different spectral positions of the absorbing states of these complexes are tuned by the presence (HL LH2) or lack (LL LH2) of specific hydrogen bonds between the chromophores and the protein backbone. Here we investigate how the protein structure controls the excitonic energy levels and their ultrafast coherent dynamics.
Keywords: Light-harvesting complex; Ultrafast dynamics; Coherent control; Single molecule; Hydrogen bonds