Spatially and time-resolved imaging of transport of indirect excitons in high magnetic fields

We present the direct measurements of magnetoexciton transport. Excitons give the opportunity to realize the high magnetic field regime for composite bosons with magnetic fields of a few Tesla. Long lifetimes of indirect excitons allow the study kinetics of magnetoexciton transport with time-resolve...

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Bibliographic Details
Published in:arXiv.org 2017-05
Main Authors: Dorow, C J, Hasling, M W, Calman, E V, Butov, L V, Wilkes, J, Campman, K L, Gossard, A C
Format: Article
Language:English
Subjects:
Bosons
Diffusion coefficient
Excitons
Imaging
Magnetic fields
Photoluminescence
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Summary:We present the direct measurements of magnetoexciton transport. Excitons give the opportunity to realize the high magnetic field regime for composite bosons with magnetic fields of a few Tesla. Long lifetimes of indirect excitons allow the study kinetics of magnetoexciton transport with time-resolved optical imaging of exciton photoluminescence. We performed spatially, spectrally, and time-resolved optical imaging of transport of indirect excitons in high magnetic fields. We observed that increasing magnetic field slows down magnetoexciton transport. The time-resolved measurements of the magnetoexciton transport distance allowed for an experimental estimation of the magnetoexciton diffusion coefficient. An enhancement of the exciton photoluminescence energy at the laser excitation spot was found to anti-correlate with the exciton transport distance. A theoretical model of indirect magnetoexciton transport is presented and is in agreement with the experimental data.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.09077