Double quantum dots as a high sensitive submillimeter-wave detector

Details Double quantum dots as a high sensitive submillimeter-wave detector Double quantum dots as a high sensitive submillimeter-wave detector

2001-04-06

arxiv.org/abs/cond-mat/0104104v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 4 figures, REVTeX, submitted to Appl.Phys.Lett

Scientific paper

10.1063/1.1396628

A single electron transistor (SET) consisting of parallel double quantum dots fabricated in a GaAs/Al$_{x}$Ga$_{1-x}$As heterostructure crystal is demonstrated to serve as an extremely high sensitive detector of submillimeter waves (SMMW). One of the double dots is ionized by SMMW via Kohn-mode plasma excitation, which affects the SET conductance through the other quantum dot yielding the photoresponse. Noise equivalent power of the detector for wavelengths about 0.6 mm is estimated to reach the order of $10^{-17}$ W/$\sqrt{Hz}$ at 70 mK.

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