Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells

Abstract

The mechanisms for generation of long-lived spin coherence in a two-dimensional electron gas (2DEG) have been studied experimentally by means of a picosecond pump-probe Kerr rotation technique. CdTe/(Cd,Mg)Te quantum wells with a diluted 2DEG were investigated. The strong Coulomb interaction between electrons and holes, which results in large binding energies of neutral excitons and negatively charged excitons (trions), allows one to address selectively the exciton or trion states by resonant optical excitation. Different scenarios of spin coherence generation were analyzed theoretically, among them the direct trion photocreation, the formation of trions from photogenerated excitons and the electron-exciton exchange scattering. Good agreement between experiment and theory is found.

18 pages, 20 figures

References in corpus (5)

• Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
• Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot
• Spin coherence of holes in GaAs/AlGaAs quantum wells
• Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique
• Enhancement of the electron spin memory by localization on donors in a quantum well

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