Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 2: Polaritonic Effects in Molecular Systems I (joint session MO/Q)

MO 2.6: Vortrag

Montag, 10. März 2025, 12:15–12:30, HS XV

Higher excitations manifolds in the Tavis-Cummings model for multi-level systems — •Lucas Borges, Thomas Schnappinger, and Markus Kowalewski — Department of Physics, Stockholm University, Stockholm, Sweden

The Tavis-Cummings model describes the interaction of multiple quantum emitters, such as atoms or molecules, with the quantized electromagnetic field modes of an optical cavity, leading to the emergence of polariton states (eigenstates of the coupled system). Most studies focus on the first excitation manifold, which includes states with a single excitation (one photon or one excited atom). The polariton states within this manifold are well separated into bright and dark states.

However, molecular ensembles in a cavity may carry multiple excitations, thus requiring the inclusion of higher excitation manifolds. We present a study of a system of N three-level systems coupled to a single lossy cavity mode, truncating the Hamiltonian to the Nth excitation manifold. The system models a molecular ensemble, where two levels are directly coupled to the cavity, while the third level is weakly coupled to the second energy level. We show that when a fraction of the system’s excitations initially reside in these third levels, the cavity mediates its decay to the ground state, revealing a new pathway influenced by the cavity dynamics.

Keywords: Polaritonic Chemistry; Cavity Quantum Electrodynamics; Tavis Cummings Model