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Separating single- from multi-particle dynamics in nonlinear spectroscopy

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476119" target="_blank" >RIV/00216208:11320/23:10476119 - isvavai.cz</a>

  • Výsledek na webu

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=gyBy98zTGG" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=gyBy98zTGG</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1038/s41586-023-05846-7" target="_blank" >10.1038/s41586-023-05846-7</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Separating single- from multi-particle dynamics in nonlinear spectroscopy

  • Popis výsledku v původním jazyce

    Quantum states depend on the coordinates of all their constituent particles, with essential multi-particle correlations. Time-resolved laser spectroscopy(1) is widely used to probe the energies and dynamics of excited particles and quasiparticles such as electrons and holes(2,3), excitons(4-6), plasmons(7), polaritons(8) or phonons(9). However, nonlinear signals from single- and multiple-particle excitations are all present simultaneously and cannot be disentangled without a priori knowledge of the system(4,10). Here, we show that transient absorption-the most commonly used nonlinear spectroscopy-with N prescribed excitation intensities allows separation of the dynamics into N increasingly nonlinear contributions; in systems well-described by discrete excitations, these N contributions systematically report on zero to N excitations. We obtain clean single-particle dynamics even at high excitation intensities and can systematically increase the number of interacting particles, infer their interaction energies and reconstruct their dynamics, which are not measurable via conventional means. We extract single- and multiple-exciton dynamics in squaraine polymers(11,12) and, contrary to common assumption(6,13), we find that the excitons, on average, meet several times before annihilating. This surprising ability of excitons to survive encounters is important for efficient organic photovoltaics(14,15). As we demonstrate on five diverse systems, our procedure is general, independent of the measured system or type of observed (quasi)particle and straightforward to implement. We envision future applicability in the probing of (quasi)particle interactions in such diverse areas as plasmonics(7), Auger recombination(2) and exciton correlations in quantum dots(5,16,17), singlet fission(18), exciton interactions in two-dimensional materials(19) and in molecules(20,21), carrier multiplication(22), multiphonon scattering(9) or polariton-polariton interaction(8).

  • Název v anglickém jazyce

    Separating single- from multi-particle dynamics in nonlinear spectroscopy

  • Popis výsledku anglicky

    Quantum states depend on the coordinates of all their constituent particles, with essential multi-particle correlations. Time-resolved laser spectroscopy(1) is widely used to probe the energies and dynamics of excited particles and quasiparticles such as electrons and holes(2,3), excitons(4-6), plasmons(7), polaritons(8) or phonons(9). However, nonlinear signals from single- and multiple-particle excitations are all present simultaneously and cannot be disentangled without a priori knowledge of the system(4,10). Here, we show that transient absorption-the most commonly used nonlinear spectroscopy-with N prescribed excitation intensities allows separation of the dynamics into N increasingly nonlinear contributions; in systems well-described by discrete excitations, these N contributions systematically report on zero to N excitations. We obtain clean single-particle dynamics even at high excitation intensities and can systematically increase the number of interacting particles, infer their interaction energies and reconstruct their dynamics, which are not measurable via conventional means. We extract single- and multiple-exciton dynamics in squaraine polymers(11,12) and, contrary to common assumption(6,13), we find that the excitons, on average, meet several times before annihilating. This surprising ability of excitons to survive encounters is important for efficient organic photovoltaics(14,15). As we demonstrate on five diverse systems, our procedure is general, independent of the measured system or type of observed (quasi)particle and straightforward to implement. We envision future applicability in the probing of (quasi)particle interactions in such diverse areas as plasmonics(7), Auger recombination(2) and exciton correlations in quantum dots(5,16,17), singlet fission(18), exciton interactions in two-dimensional materials(19) and in molecules(20,21), carrier multiplication(22), multiphonon scattering(9) or polariton-polariton interaction(8).

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Návaznosti výsledku

  • Projekt

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2023

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    Nature

  • ISSN

    0028-0836

  • e-ISSN

    1476-4687

  • Svazek periodika

    616

  • Číslo periodika v rámci svazku

    7956

  • Stát vydavatele periodika

    GB - Spojené království Velké Británie a Severního Irska

  • Počet stran výsledku

    13

  • Strana od-do

    280-292

  • Kód UT WoS článku

    000960436400001

  • EID výsledku v databázi Scopus

    2-s2.0-85150909628