@Article{Nevou_etal2011,
author="Nevou, L.
and Liverini, V.
and Friedli, P.
and Castellano, F.
and Bismuto, A.
and Sigg, H.
and Gramm, F.
and M{\"u}ller, E.
and Faist, J.",
title="Current quantization in an optically driven electron pump based on self-assembled quantum dots",
journal="Nature Physics",
year="2011",
volume="7",
pages="423--427",
optkeywords="fromIPMRAS",
abstract="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.",
optnote="exported from refbase (https://db.rplab.ru/refbase/show.php?record=841), last updated on Wed, 13 Jun 2012 19:36:07 -0500"
}