Semiclassical Broadening in Quantum Dot Thermometry

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We studied the experimental conditions required for the accurate measurement of the electron temperature by using quantum dot (QD) thermometry. The physical requirements were examined by numerically evaluating the QD conductance as a function of QD-reservoir coupling and the electron temperature. An empirical formula for the Coulomb blockade peak at all coupling strengths was suggested. Thereafter, practical limitations set by voltage noise were investigated through a semiclassical treatment of the QD. A noise-broadening, in addition to thermal broadening, was identified, and a noise limit was provided for a given electron temperature. The analysis was applied to a realistic measurement setup by considering a dilution fridge equipped with low-pass RC-filters. We found that careful placements of filters were crucial in order to avoid thermal noise from the filters while measuring ultralow electron temperatures.
Publisher
KOREAN PHYSICAL SOC
Issue Date
2020-09
Language
English
Article Type
Article
Citation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.77, no.6, pp.489 - 495

ISSN
0374-4884
DOI
10.3938/jkps.77.489
URI
http://hdl.handle.net/10203/281887
Appears in Collection
RIMS Journal Papers
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