Incoherent charge transport in an organic polariton condensate

Zeb, M. Ahsan and Kirton, Peter G. and Keeling, Jonathan (2022) Incoherent charge transport in an organic polariton condensate. Physical Review B, 106 (19). 195109. ISSN 2469-9950 (https://doi.org/10.1103/PhysRevB.106.195109)

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Abstract

We study how polariton condensation modifies charge transport in organic materials. In typical organic materials, charge transport proceeds via incoherent hopping. We therefore provide an approach to determine how the rate and final state of this hopping process is affected by strong matter-light coupling and polariton condensation. We show how the hopping process may create excitations when starting from a state with a finite excitation density. That is, how hopping can change the state of a lower polariton condensate by creating upper polaritons, optically inactive excitonic dark states, or by exciting vibrational sidebands. While the matrix elements for these processes can be large, for typical materials at room temperature, such excitations are suppressed by thermal factors, and ground-state processes dominate. We thus study how the ground-state hopping rate depends on condensate density, matter-light coupling, and cavity photon detuning. All these factors change the vibrational configuration associated with the optically active molecules, which can enhance or suppress hopping by increasing or decreasing the vibrational overlap with the state of a charged molecule. We show that hopping rates can be exponentially sensitive to detuning and condensate density, allowing an increase or decrease of hopping rate by two orders of magnitude.

ORCID iDs

Zeb, M. Ahsan, Kirton, Peter G. ORCID logoORCID: https://orcid.org/0000-0002-3915-1098 and Keeling, Jonathan;
  • Item type:Article
    ID code:83079
    Dates:
    Date
    Event
    3 November 2022
    Published
    20 October 2022
    Accepted
    25 July 2022
    Submitted
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:07 Nov 2022 14:31
    Last modified:11 Nov 2024 13:41
    URI:https://strathprints.strath.ac.uk/id/eprint/83079
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