Spin dependent analysis of homogeneous and inhomogeneous exciton decoherence in magnetic fields

This paper discusses the combined effects of optical excitation power, interface roughness, lattice temperature, and applied magnetic fields on the spin-coherence of excitonic states in GaAs/AlGaAs multiple quantum wells. For low optical powers, at lattice temperatures between 4 K and 50 K, the scat...

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Bibliographic Details
Published in:arXiv.org 2022-01
Main Authors: Laurindo, V, Guarin Castro, E D, Jacobsen, G M, E R C de Oliveira, Domenegueti, J F M, Alén, B, Mazur, Yu I, Salamo, G J, Marques, G E, Marega, E, Teodoro, M D, Lopez-Richard, V
Format: Article
Language:English
Subjects:
Circular polarization
Coherence
Interface roughness
Magnetic fields
Photoluminescence
Quantum wells
Relaxation time
Scattering
Online Access:Get full text
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Summary:This paper discusses the combined effects of optical excitation power, interface roughness, lattice temperature, and applied magnetic fields on the spin-coherence of excitonic states in GaAs/AlGaAs multiple quantum wells. For low optical powers, at lattice temperatures between 4 K and 50 K, the scattering with acoustic phonons and short-range interactions appear as the main decoherence mechanisms. Statistical fluctuations of the band-gap however become also relevant in this regime and we were able to deconvolute them from the decoherence contributions. The circularly polarized magneto-photoluminescence unveils a non-monotonic tuning of the coherence for one of the spin components at low magnetic fields. This effect has been ascribed to the competition between short-range interactions and spin-flip scattering, modulated by the momentum relaxation time.
ISSN:2331-8422
DOI:10.48550/arxiv.2107.02129