Title of article
A two-dimensional electron gas as a sensitive detector to observe the charge carrier dynamics of self-assembled QDs
Author/Authors
Bastian Marquardt، نويسنده , , Martin Geller، نويسنده , , Axel Lorke، نويسنده , , Dirk Reuter، نويسنده , , Andreas D. Wieck، نويسنده ,
Issue Information
ماهنامه با شماره پیاپی سال 2009
Pages
4
From page
2598
To page
2601
Abstract
The carrier tunneling dynamics of self-assembled InAs quantum dots (QD) is studied using a time-resolved conductance measurement of a nearby two-dimensional electron gas (2DEG). The investigated heterostructures consist of a layer of QDs with different coupling strengths to a 2DEG, adjusted by different thicknesses of the spacer layers. We demonstrate a strong influence of charged QDs on the conductance of the 2DEG, even for very weak coupling between the QD layer and the 2D system, where standard capacitance (C)–voltage (V) spectroscopy is unsuitable to investigate the electronic structure of these QDs.
Keywords
Indium compounds , Self-assembly , Semiconductor quantum dots , Tunnelling , III–V semiconductors , Two-dimensional electron gas
Journal title
Physica E Low-dimensional Systems and Nanostructures
Serial Year
2009
Journal title
Physica E Low-dimensional Systems and Nanostructures
Record number
1048402
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