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.
- Received 27 June 2014
DOI:https://doi.org/10.1103/PhysRevApplied.2.024001
© 2014 American Physical Society
Synopsis
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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