Ultrafast manipulation of electron spin coherence

J. A. Gupta, R. Knobel, N. Samarth, D. D. Awschalom

Research output: Contribution to journalArticlepeer-review

254 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2458-2461
Number of pages4
Issue number5526
StatePublished - Jun 29 2001

All Science Journal Classification (ASJC) codes

  • General


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