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A Two-Dimensional Electron Gas as a Sensitive Detector for Time-Resolved Tunneling Measurements on Self-Assembled Quantum Dots

Geller, Martin and Marquardt, Bastian and Lorke, Axel and Reuter, Dirk and Wieck, Andreas D. (2010) A Two-Dimensional Electron Gas as a Sensitive Detector for Time-Resolved Tunneling Measurements on Self-Assembled Quantum Dots. Nanoscale Research Letters, 5 (5). pp. 829-833.

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Abstract

A two-dimensional electron gas (2DEG) situated nearby a single layer of self-assembled quantum dots (QDs) in an inverted high electron mobility transistor (HEMT) structure is used as a detector for time-resolved tunneling measurements. We demonstrate a strong influence of charged QDs on the conductance of the 2DEG which allows us to probe the tunneling dynamics between the 2DEG and the QDs time resolved. Measurements of hysteresis curves with different sweep times and real-time conductance measurements in combination with an boxcar-like evaluation method enables us to unambiguously identify the transients as tunneling events between the s- and p-electron QD states and the 2DEG and rule out defect-related transients.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nanoelectronics
Physical Science > Quantum phenomena
ID Code:9007
Deposited By:Lesley Tobin
Deposited On:17 Aug 2010 16:28
Last Modified:17 Aug 2010 16:28

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