Thomas B Gill, Sergei Pavlov, Connor S Kidd, Paul Dean, Andrew D Burnett, Aniela Dunn, Lianhe Li, Nikolay V Abrosimov, Heinz-Wilhelm Hübers, Edmund H Linfield, A Giles Davies, Joshua R Freeman
We present measurements of the coherence times of excited states of hydrogen-like arsenic impurities in germanium (Ge:As) using a table-top two-dimensional time-domain spectroscopy (2D-TDS) system. We show that this laboratory system is capable of resolving the coherence lifetimes of atomic-like excited levels of impurity centers in semiconductors, such as those used in solid-state quantum information technologies, on a subpicosecond time scale. By fitting the coherent nonlinear response of the system with the known intracenter transition frequencies, we are able to monitor coherent population transfer and decay of the transitions from the 2p0 and 2p± states for different low excitation pulse fields...
April 17, 2024: ACS Photonics