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Phys Rev Lett. 2001 Oct 8;87(15):157401. Epub 2001 Sep 20.

Ultralong dephasing time in InGaAs quantum dots.

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  • 1Experimentelle Physik IIb, Universit├Ąt Dortmund, Otto-Hahn Strasse 4, D-44221 Dortmund, Germany.


We measure a dephasing time of several hundred picoseconds at low temperature in the ground-state transition of strongly confined InGaAs quantum dots, using a highly sensitive four-wave mixing technique. Between 7 and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian line shape with a lifetime-limited zero-phonon line and a broadband from elastic exciton-acoustic phonon interactions.

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