Journal Article

PUBDB-2024-01105

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unraveling quantum coherences mediating primary charge transfer processes in photosystem II reaction center

Jha, A. ; Zhang, P.-P. ; Tiwari, V. ; Chen, L. ; Thorwart, M. R. (Corresponding author)Extern* ; Miller, D. (Corresponding author)CFEL*MPG* ; Duan, H.-G. (Corresponding author)Extern*

2024
Assoc. Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/sciadv.adk1312  doi:10.3204/PUBDB-2024-01105

Abstract: Photosystem II (PSII) reaction center (RC) is a unique complex that is capable of efficiently separating electronic charges across the membrane. The primary energy- and charge-transfer (CT) processes occur on comparable ultrafast timescales, which makes it extremely challenging to understand the fundamental mechanism responsible for the near-unity quantum efficiency of the transfer. Here, we elucidate the role of quantum coherences in the ultrafast energy and CT in the PSII RC by performing two-dimensional (2D) electronic spectroscopy at the cryogenic temperature of 20 kelvin, which captures the distinct underlying quantum coherences. Specifically, we uncover the electronic and vibrational coherences along with their lifetimes during the primary ultrafast processes of energy and CT. We construct an excitonic model that provides evidence for coherent energy and CT at low temperature in the 2D electronic spectra. The principles could provide valuable guidelines for creating artificial photosystems with exploitation of system-bath coupling and control of coherences to optimize the photon conversion efficiency to specific functions.

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Contributing Institute(s):

1. Forschungsgruppe für strukturelle Dynamik (MPSD)
2. MPSD (CFEL-ARD)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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