Abstract

Femtosecond-resolved measurements of induced Faraday rotation reveal exchange coupling between the spin angular momenta of charge carriers and a sublattice of magnetic ions in semiconductor quantum wells. In transverse magnetic fields, we observe terahertz spin precession of photoinjected electrons, rapid spin relaxation of holes, and the coherent transfer of angular momentum to the magnetic sublattice via the ultrafast rotation of the local moments. The perturbed ions undergo free-induction decay, enabling time-domain all-optical electron-spin-resonance measurements in single magnetic planes.

Keywords

PhysicsCondensed matter physicsLarmor precessionFaraday effectSpin (aerodynamics)PrecessionSpin engineeringFree induction decayAngular momentum couplingAtomic physicsAngular momentumElectronSpin polarizationTotal angular momentum quantum numberMagnetic fieldSpin echoQuantum mechanics

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Publication Info

Year
1996
Type
article
Volume
77
Issue
13
Pages
2814-2817
Citations
194
Access
Closed

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Cite This

S. A. Crooker, Jeremy J. Baumberg, F. Flack et al. (1996). Terahertz Spin Precession and Coherent Transfer of Angular Momenta in Magnetic Quantum Wells. Physical Review Letters , 77 (13) , 2814-2817. https://doi.org/10.1103/physrevlett.77.2814

Identifiers

DOI
10.1103/physrevlett.77.2814