Stochastic Coulomb blockade and scaling of charging energy in a double quantum dot system

We have studied the transport properties of a device consisting of two quantum dots, defined electrostatically in a (Al.Ga)As heterostructure. In the series conductance of the two dots, we observe irregularly spaced conductance peaks of fluctuating amplitude. This behaviour results from transport in...

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Hauptverfasser: Molenkamp, Laurens W. (VerfasserIn) , Kemerink, Martijn (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 7 July 2009
In: Superlattices and microstructures
Year: 1994, Jahrgang: 16, Heft: 3, Pages: 275-278
ISSN:1096-3677
DOI:10.1016/S0749-6036(09)80014-1
Online-Zugang:Verlag, Volltext: https://doi.org/10.1016/S0749-6036(09)80014-1
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0749603609800141
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Verfasserangaben:L.W. Molenkamp and M. Kemerink

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520 |a We have studied the transport properties of a device consisting of two quantum dots, defined electrostatically in a (Al.Ga)As heterostructure. In the series conductance of the two dots, we observe irregularly spaced conductance peaks of fluctuating amplitude. This behaviour results from transport in the stochastic Coulomb blockade regime. In a second experiment, we measure the charging energy of one dot through the effect of its potential (which varies in a saw-tooth fashion with gate voltage) on the conductance of the other dot. We find that the charging energy scales quadrat-ically with the reflection probability of the tunnel barriers, in agreement with a recent theory. 
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