Bloch vector Rabi oscillation dynamics of a single quantum dot exciton coupled to acoustic phonons
Posted on 2018-11-06 - 14:48
While the advanced coherent control of qubits is now routinely carried out in low frequency (GHz) systems like single spins, it is far more challenging to achieve for two-level systems in the optical domain. This is because the latter evolve typically in the THz range, calling for tools of ultrafast, coherent, nonlinear optics. Using four-wave mixing micro-spectroscopy, we here measure the optically driven Bloch vector dynamics of a single exciton confined in a semiconductor quantum dot. In a combined experimental and theoretical approach, we reveal the intrinsic Rabi oscillation dynamics by monitoring both central exciton quantities, i.e., its occupation and the microscopic coherence, as resolved by the four-wave mixing technique. In the frequency domain this oscillation generates the Autler-Townes splitting of the light-exciton dressed states, directly seen in the four-wave mixing spectra. We further demonstrate that the coupling to acoustic phonons strongly influences the FWM dynamics on the picosecond timescale, because it leads to transitions between the dressed states.
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Wigger, Daniel; Schneider, Christian; Gerhardt, Stefan; Kamp, Martin; Höfling, Sven; Kuhn, Tilmann; et al. (2018). Bloch vector Rabi oscillation dynamics of a single quantum dot exciton coupled to acoustic phonons. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4245947.v1
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AUTHORS (7)
DW
Daniel Wigger
CS
Christian Schneider
SG
Stefan Gerhardt
MK
Martin Kamp
SH
Sven Höfling
TK
Tilmann Kuhn
JK
Jacek Kasprzak