TY  - JOUR
A1  - Kasprzak, J.
A1  - Sivalertporn, K.
A1  - Albert, F.
A1  - Schneider, C.
A1  - Höfling, S.
A1  - Kamp, M.
A1  - Forchel, A.
A1  - Muljarov, E. A.
A1  - Langbein, W.
T1  - Coherence dynamics and quantum-to-classical crossover in an exciton-cavity system in the quantum strong coupling regime
JF  - New Journal of Physics
N2  - Interaction between light and matter generates optical nonlinearities, which are particularly pronounced in the quantum strong coupling regime. When a single bosonic mode couples to a single fermionic mode, a Jaynes-Cummings (JC) ladder is formed, which we realize here using cavity photons and quantum dot excitons. We measure and model the coherent anharmonic response of this strongly coupled exciton-cavity system at resonance. Injecting two photons into the cavity, we demonstrate a \(\sqrt 2\) larger polariton splitting with respect to the vacuum Rabi splitting. This is achieved using coherent nonlinear spectroscopy, specifically four-wave mixing, where the coherence between the ground state and the first (second) rung of the JC ladder can be interrogated for positive (negative) delays. With increasing excitation intensity and thus rising average number of injected photons, we observe spectral signatures of the quantum-to-classical crossover of the strong coupling regime.
KW  - Jaynes-Cummings ladder
KW  - spectral interferometry
KW  - photon
KW  - dot
KW  - spectroscopy
KW  - oscillations
KW  - microcavity
KW  - resonance
KW  - light
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-123005
SN  - 1367-2630
VL  - 15
IS  - 045013
ER  -