Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots

Abstract

We investigate exciton spin memory in individual InAs/GaAs self-assembled quantum dots via optical alignment and conversion of exciton polarization in a magnetic field. Quasiresonant phonon-assisted excitation is successfully employed to define the initial spin polarization of neutral excitons. The conservation of the linear polarization generated along the bright exciton eigenaxes of up to 90% and the conversion from circular- to linear polarization of up to 47% both demonstrate a very long spin relaxation time with respect to the radiative lifetime. Results are quantitatively compared with a model of pseudo-spin 1/2 including heavy-to-light hole mixing.

5 pages, 3 figures

References in corpus (6)

• Quantum Computation with Quantum Dots
• Driven coherent oscillations of a single electron spin in a quantum dot
• Optical detection of single electron spin resonance in a quantum dot
• Fast exciton spin relaxation in single quantum dots
• Quantum-dot-based optical polarization conversion
• Manipulating the exciton fine structure of single CdTe/ZnTe quantum dots by an in-plane magnetic field

Cited by in corpus (12)

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• Supercoupling between heavy-hole and light-hole states in self-assembled quantum dots
• Theory of excitons in cubic III-V semiconductor GaAs, InAs and GaN quantum dots: fine structure and spin relaxation
• Controlling the polarization eigenstate of a quantum dot exciton with light
• Spin-orbit induced hole spin relaxation in InAs and GaAs quantum dots
• Coherent population trapping combined with cycling transitions for quantum dot hole spins using triplet trion states
• Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking
• Coherent spin dynamics of excitons in strained monolayer semiconductors
• Angular harmonics of the excitonic polarization conversions effect