Optical control of electron spin coherence in CdTe/(Cd,Mg)Te quantum wells

Abstract

Optical control of the spin coherence of quantum well electrons by short laser pulses with circular or linear polarization is studied experimentally and theoretically. For that purpose the coherent electron spin dynamics in a n-doped CdTe/(Cd,Mg)Te quantum well structure was measured by time-resolved pump-probe Kerr rotation, using resonant excitation of the negatively charged exciton (trion) state. The amplitude and phase shifts of the electron spin beat signal in an external magnetic field, that are induced by laser control pulses, depend on the pump-control delay and polarization of the control relative to the pump pulse. Additive and non-additive contributions to pump-induced signal due to the control are isolated experimentally. These contributions can be well described in the framework of a two-level model for the optical excitation of the resident electron to the trion.

15 pages, 18 figures

References in corpus (5)

• Ultrafast optical rotations of electron spins in quantum dots
• Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
• Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
• Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells
• Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells

Cited by in corpus (12)

• Spin dynamics in semiconductors
• Coherent spin dynamics of electrons and excitons in nanostructures
• Coherent spin dynamics of electrons and holes in semiconductor quantum wells and quantum dots under periodical optical excitation: resonant spin amplification versus spin mode-locking
• Effect of pump-probe detuning on the Faraday rotation and ellipticity signals of mode-locked spins in InGaAs quantum dots
• Spin polarization recovery and Hanle effect for charge carriers interacting with nuclear spins in semiconductors
• All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime
• Damping of Rabi oscillations in intensity-dependent photon echoes from exciton complexes in a CdTe/(Cd,Mg)Te single quantum well
• Unambiguous determination of spin dephasing times in ZnO
• Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling
• Optical measurement of electron spins in quantum dots: Quantum Zeno effects
• Tuning the nuclei-induced spin relaxation of localized electrons by the quantum Zeno and anti-Zeno effects
• Long-lived electron spins in a modulation doped (100) GaAs quantum well