Ultrafast transmission changes around the fundamental trion resonance are studied after exciting a p-shell exciton in a negatively charged II-VI quantum dot. The biexcitonic induced absorption reveals quantum beats between hot trion states at 133 GHz. While interband dephasing is dominated by relaxation of the P-shell hole within 390 fs, trionic coherence remains stored in the spin system for 85 ps due to Pauli blocking of the triplet electron. The complex spectro-temporal evolution of transmission is explained analytically by solving the Maxwell-Liouville equations. Pump and probe polarizations provide full control over amplitude and phase of the quantum beats.
@article{arxiv.2011.10393,
title = {Femtosecond Transfer and Manipulation of Persistent Hot-Trion Coherence in a Single CdSe/ZnSe Quantum Dot},
author = {Philipp Henzler and Christian Traum and Matthias Holtkemper and David Nabben and Marcel Erbe and Doris E. Reiter and Tilmann Kuhn and Suddhassatta Mahapatra and Karl Brunner and Denis V. Seletskiy and Alfred Leitenstorfer},
journal= {arXiv preprint arXiv:2011.10393},
year = {2021}
}