SAMOP 2023 – scientific programme

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MO: Fachverband Molekülphysik

MO 2: Photochemistry

MO 2.6: Talk

Monday, March 6, 2023, 12:15–12:30, F142

The role of dephasing for dark states and polaritonic chemistry — •Eric Davidsson and Markus Kowalewski — Department of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, Sweden

Common quantum-mechanical models for chemistry in optical cavities lack a mechanism to populate collective dark states. In this work, we explicitly model a process that does populate these states; i.e. disorder from loss of phase information (decoherence) in the matter sub-systems. Such processes arise due to local environment interactions, and the effect enters into the equations of motion as dephasing operators. Viewed through the lens of polaritonic states, a reservoir of previously inaccessible states has thus opened up. Since these states are superpositions of excitations in only matter sub-systems, one would expect that dephasing can protect excited states from photon decay. In this work, we find that dephasing indeed does that quite effectively. We also discuss how to understand the same physical result in a standard product basis, where there are no dark states.