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Thursday, 10 October, 2013

Proposed Rabi-Kondo Correlated State in a Laser-Driven Semiconductor Quantum Dot

B. Sbierski, M. Hanl, A. Weichselbaum, H. Türeci, M. Goldstein, L. Glazman, J. von Delft, and A. İmamoğlu -
Phys. Rev. Lett., Vol. 111 (15), 157402 (2013)

Spin exchange between a single-electron charged quantum dot and itinerant electrons leads to an emergence of Kondo correlations. When the quantum dot is driven resonantly by weak laser light, the resulting emission spectrum allows for a direct probe of these correlations. In the opposite limit of vanishing exchange interaction and strong laser drive, the quantum dot exhibits coherent oscillations between the single-spin and optically excited states. Here, we show that the interplay between strong exchange and nonperturbative laser coupling leads to the formation of a new nonequilibrium quantum-correlated state, characterized by the emergence of a laser-induced secondary spin screening cloud, and examine the implications for the emission spectrum.

 

Article on journal's website