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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Effects (Cavity QED)

Q 61.8: Vortrag

Freitag, 15. März 2019, 12:15–12:30, S Gr. HS Maschb.

Chiral light-matter interaction in the ultra strong coupling limit — •Sahand Mahmoodian and Klemens Hammerer — Institute for Theoretical Physics, Leibniz University, Hannover

Chiral light-matter interaction occurs when a circularly polarized optical transition is coupled to a nanophotonic waveguide whose counter-propagating modes are engineered to be counter circulating. This leads to exciting new physics including directional emission, non-reciprocal optical dynamics, and spin-photon coupling. These phenomena can all be described within the standard rotating-wave approximation and occur because the circularly polarized transition only interacts with one of the directional modes of the waveguide; e.g. it couples to the forward mode but is orthogonal to the backward mode which is then completely absent from the interaction Hamiltonian. In this talk I will show that when including counter-rotating wave terms, the previously non-interacting mode now enters in the interaction Hamiltonian. The Hamiltonian features rotating wave interactions with, for example, the forward propagating mode and counter-rotating interactions with the backward mode. I show that this novel Hamiltonian features a symmetry which allows writing a compact ansatz for its eigenstates. The ground states of the Hamiltonian feature strong spin-photon entanglement. Additionally, the counter-rotating wave terms also lead to modified quench dynamics such as the damping of typically observed Rabi oscillations.