TY  - JOUR
AU  - Nevou, L.
AU  - Liverini, V.
AU  - Friedli, P.
AU  - Castellano, F.
AU  - Bismuto, A.
AU  - Sigg, H.
AU  - Gramm, F.
AU  - Müller, E.
AU  - Faist, J.
PY  - 2011
DA  - 2011//
TI  - Current quantization in an optically driven electron pump based on self-assembled quantum dots
T2  - Nat. Phys.
JO  - Nature Physics
SP  - 423–427
VL  - 7
KW  - fromIPMRAS
AB  - The electronic structure of self-assembled semiconductor quantum dots consists of discrete atom-like states that can be populated with a well-defined number of electrons. This property can be used to fabricate a d.c. current standard that enables the unit of ampere to be independently defined. Here we report an optically pumped current source based on self-assembled InAs/GaAs quantum dots. The accuracy obtained so far is 10–1 and is limited by the uncertainty in the number of dots. At 10 K the device generates a current difference of 2.39 nA at a frequency of 1 kHz. The accuracy could be improved by site-selective growth techniques where the number of dots is fixed by pre-patterning. The results are promising for applications in electrical metrology, where a current standard is needed to close the so-called quantum metrological triangle.
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ID  - Nevou_etal2011
ER  -