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.
Original language | English (US) |
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Pages (from-to) | 2458-2461 |
Number of pages | 4 |
Journal | Science |
Volume | 292 |
Issue number | 5526 |
DOIs | |
State | Published - Jun 29 2001 |
All Science Journal Classification (ASJC) codes
- General