Ultrafast manipulation of electron spin coherence - PubMed (original) (raw)

. 2001 Jun 29;292(5526):2458-61.

doi: 10.1126/science.1061169.

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Ultrafast manipulation of electron spin coherence

J A Gupta et al. Science. 2001.

Abstract

A technique is developed with the potential for coherent all-optical control over electron spins in semiconductors on femtosecond time scales. The experiments show that optical "tipping" pulses can enact substantial rotations of electron spins through a mechanism dependent on the optical Stark effect. These rotations were measured as changes in the amplitude of spin precession after optical excitation in a transverse magnetic field and approach pi/2 radians. A prototype sequence of two tipping pulses indicates that the rotation is reversible, a result that establishes the coherent nature of the tipping process.

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