Journal
SCIENCE
Volume 292, Issue 5526, Pages 2458-2461Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1061169
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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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