Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 44: Quantum Dots: Optical Properties II

HL 44.3: Talk

Tuesday, March 21, 2017, 15:15–15:30, POT 81

Wigner time delay — •Max Strauß¹, Christian Schneider², Martin Kamp², Sven Höfling^2,3, Janik Wolters⁴, and Stephan Reitzenstein¹ — ¹TU Berlin — ²Universtät Würzburg — ³University of St Andrews — ⁴Universität Basel

The Heitler regime of resonance fluorescence, i.e. the low power regime of optical excitation of a two-level system (TLS), has recently been an active field of research because it offers single photons with intriguing properties. Here, we report on the first experimental study of the Wigner time delay on a semiconductor quantum dot, a solid state TLS. We show experimentally that in the Heitler regime, pulses long compared to T₁, the lifetime of the emitter, are scattered almost undistortedly while being delayed in time with respect to the exciting pulse. This time delay, also called the Wigner time delay, can reach a maximum value of T₂, the dephasing time of the quantum emitter, and is closely connected to the phase lag induced by the TLS.