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Electron spin coherence has been generated optically in n-type modulationdoped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a singleelectron per dot. The coherence arises from resonant excitation of the QDs bycircularly-polarized laser pulses, creating a coherent superposition of anelectron and a trion state. Time dependent Faraday rotation is used to probethe spin precession of the optically oriented electrons about a transversemagnetic field. Spin coherence generation can be controlled by pulse intensity,being most efficient for (2n+1)pi-pulses.Comment: 5 pages, 4 figure

physical review letters

Optical Control of Spin Coherence in Singly Charged<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:mi>In</mml:mi><mml:mo>,</mml:mo><mml:mi>Ga</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mi>As</mml:mi><mml:mo>/</mml:mo><mml:mi>GaAs</mml:mi></mml:math>Quantum Dots

Optical Control of Spin Coherence in Singly Charged(In,Ga)As/GaAsQuantum Dots