Sub-Kelvin optical thermometry of an electron reservoir coupled to a self-assembled InGaAs quantum dot

We show how resonant laser spectroscopy of the trion optical transitions in a self-assembled quantum dot can be used to determine the temperature of a nearby electron reservoir. At finite magnetic field the spin-state occupation of the Zeeman-split quantum dot electron ground states is governed by t...

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Bibliographic Details
Published in:arXiv.org 2014-05
Main Authors: Seilmeier, F, Hauck, M, Schubert, E, Schinner, G J, Beavan, S E, Högele, A
Format: Article
Language:English
Subjects:
Electron energy
Electrons
Magnetic fields
Occupations
Quantum dots
Self-assembly
Spectroscopy
Spectrum analysis
Thermalization (energy absorption)
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Summary:We show how resonant laser spectroscopy of the trion optical transitions in a self-assembled quantum dot can be used to determine the temperature of a nearby electron reservoir. At finite magnetic field the spin-state occupation of the Zeeman-split quantum dot electron ground states is governed by thermalization with the electron reservoir via co-tunneling. With resonant spectroscopy of the corresponding excited trion states we map out the spin occupation as a function of magnetic field to establish optical thermometry for the electron reservoir. We demonstrate the implementation of the technique in the sub-Kelvin temperature range where it is most sensitive, and where the electron temperature is not necessarily given by the cryostat base temperature.
ISSN:2331-8422
DOI:10.48550/arxiv.1405.2261