Electrical Control of the Electron Spin Dynamics in [111]-oriented GaAs/AGaAs Quantum Wells PDF Download

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Electrical Control of the Electron Spin Dynamics in [111]-oriented GaAs/AGaAs Quantum Wells

Electrical Control of the Electron Spin Dynamics in [111]-oriented GaAs/AGaAs Quantum Wells PDF Author: Quang ha Duong
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Languages : en
Pages : 125

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Book Description
We have studied the electron spin dynamics in 111-oriented GaAs/AlGaAs quantum wells grown on 111-substrate by time-resolved photoluminescence spectroscopy. By applying an external electric field about 50 kV/cm along growth direction, we observed the spectacular increase of electron spin which can attain values greater than 30 ns. This phenomenon comes from the electrical control of spin-orbit interaction in conduction band that make the Rashba term compensate exactly with the Dresselhaus term. The cancellation effect of these two terms results in the suppression of electron spin relaxation induced by D'yakonov-Perelmechanism which is dominant in undoped quantum wells and at the temperatures greater than 50K. The measurement under an external transverse magnetic field (Voigt configuration) demonstrates that the spin relaxation times in three spatial directions are also controlled simultaneously by electric field. The "total" control of electron spin relaxation can only be observed in 111-oriented quantum wells. Finally, we also develop the model to interpret the experimental measurement of spin relaxation anisotropy depending on electric field in 111-oriented quantum wells.