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Single Quantum Dot as an Optical Thermometer for Millikelvin Temperatures

Florian Haupt, Atac Imamoglu, and Martin Kroner
Phys. Rev. Applied 2, 024001 – Published 1 August 2014
Physics logo See Synopsis: Measuring Millikelvin Temperatures with Quantum Dots

Abstract

Resonant laser spectroscopy of a negatively charged self-assembled quantum dot is utilized to measure the temperature of a three-dimensional fermionic reservoir down to 100 mK. With a magnetic field applied to the quantum dot, the single-charged ground state is split by the Zeeman energy. As the quantum dot is in tunnel contact with a thermal electron reservoir, a thermal occupation of the quantum-dot spin states is enforced by cotunneling processes. Resonant laser-induced fluorescence is used in order to measure the thermal quantum-dot spin-state population.

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  • Received 27 June 2014

DOI:https://doi.org/10.1103/PhysRevApplied.2.024001

© 2014 American Physical Society

Synopsis

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Measuring Millikelvin Temperatures with Quantum Dots

Published 1 August 2014

Researchers have shown that millikelvin temperatures can be reliably measured using the ground-state optical properties of quantum dots.

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Authors & Affiliations

Florian Haupt, Atac Imamoglu, and Martin Kroner*

  • Institute of Quantum Electronics, ETH Zürich, CH-8093 Zurich, Switzerland

  • *Corresponding author. mkroner@phys.ethz.ch

See Also

Optical Thermometry of an Electron Reservoir Coupled to a Single Quantum Dot in the Millikelvin Range

F. Seilmeier, M. Hauck, E. Schubert, G. J. Schinner, S. E. Beavan, and A. Högele
Phys. Rev. Applied 2, 024002 (2014)

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Vol. 2, Iss. 2 — August 2014

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