Shedding light on non-equilibrium dynamics of a spin coupled to fermionic reservoir - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: A single confined spin interacting with a solid-state environment has emergedas one of the fundamental paradigms of mesoscopic physics. In contrast tostandard quantum optical systems, decoherence that stems from theseinteractions can in general not be treated using the Born-Markov approximationat low temperatures. Here we study the non-equilibrium dynamics of asingle-spin in a semiconductor quantum dot adjacent to a fermionic reservoirand show how the dynamics can be revealed in detail in an optical absorptionexperiment. We show that the highly asymmetrical optical absorption lineshapeof the resulting Kondo exciton consists of three distinct frequency domains,corresponding to short, intermediate and long times after the initialexcitation, which are in turn described by the three fixed points of thesingle-impurity Anderson Hamiltonian. The zero-temperature power-lawsingularity dominating the lineshape is linked to dynamically generated Kondocorrelations in the photo-excited state. We show that this power-lawsingularity is tunable with gate voltage and magnetic field, and universal.



Author: Hakan E. Türeci, M. Hanl, M. Claassen, A. Weichselbaum, T. Hecht, B. Braunecker, A. Govorov, L. Glazman, J. von Delft, A. Imamog

Source: https://arxiv.org/







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