Exciton Spin Relaxation Time in Quantum Dots Measured by Continuous-Wave Photoluminescence Spectroscopy

Abstract

We demonstrate a new method of measuring the exciton spin relaxation time in semiconductor nanostructures by continuous-wave photoluminescence. We find that for self-assembled CdTe quantum dots the degree of circular polarization of emission is larger when exciting polarized excitons into the lower energy spin state than in the case when the excitons are excited into the higher energy spin state. A simple rate equation model gives the exciton spin relaxation time in CdTe quantum dots equal to 4.8+/-0.3 ns, significantly longer than the quantum dot exciton recombination time 300 ps.

11 pages, 3 figures

References in corpus (2)

• Quantum Computation with Quantum Dots
• Spin relaxation in semiconductor quantum dots

Cited by in corpus (7)

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• Sensitivity of Exciton Spin Relaxation in Quantum Dots to Confining Potential
• Sub-Wavelength Multi-Channel Imaging Using a Solid Immersion Lens: Spectroscopy of Excitons in Single Quantum Dots
• Optical Studies of Zero-Field Magnetization of CdMnTe Quantum Dots: Influence of Average Size and Composition of Quantum Dots
• Single spin optical read-out in CdTe/ZnTe quantum dot studied by photon correlation spectroscopy