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Ultrafast Manipulation of Electron Spin Coherence

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Science  29 Jun 2001:
Vol. 292, Issue 5526, pp. 2458-2461
DOI: 10.1126/science.1061169

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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 π/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.

  • * To whom correspondence should be addressed. E-mail: awsch{at}physics.ucsb.edu

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