Polarization dynamics and optical selection rules for excitonic transitions in strained quantum wells

Hawkins, Scot A.; Stevens, Martin J.; Smirl, Arthur L.

doi:10.1103/physrevb.64.035302

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2004

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“…We determine the spin-up and spin-down carrier population at each position by varying the probe polarization and using the circular polarization optical selection rules for excitonic transitions [11][12][13]. Since the probe is tuned to the heavy-hole excitonic resonance, the change in transmission of a right circularly ( ) polarized probe is a measure of spin-down electron density, n # (or change in that density, n # ).…”

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Quantum Interference Control of Ballistic Pure Spin Currents in Semiconductors

et al. 2003

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We demonstrate all-optical quantum interference injection and control of a ballistic pure spin current (without an accompanying charge current) in GaAs/AlGaAs quantum wells, consisting of spin-up electrons traveling in one direction and spin-down electrons traveling in the opposite direction. This current is generated through quantum interference of one- and two-photon absorption of approximately 100 fs phase-locked pulses that have orthogonal linear polarizations. We use a spatially resolved pump-probe technique to measure carrier movement of approximately 10 nm. Results agree with recent theoretical predictions.

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confidence: 99%