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

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• 作者：Martin Geller (1)
  Bastian Marquardt (1)
  Axel Lorke (1)
  Dirk Reuter (2)
  Andreas D. Wieck (2)
  
• 关键词：III鈥揤 semiconductors ; Indium compounds ; Self ; assembly ; Semiconductor quantum dots ; Tunneling ; Two ; dimensional electron gas
• 刊名：Nanoscale Research Letters
• 出版年：2010
• 出版时间：May 2010
• 年：2010
• 卷：5
• 期：5
• 页码：829-833
• 全文大小：505KB
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• 作者单位：Martin Geller (1)
  Bastian Marquardt (1)
  Axel Lorke (1)
  Dirk Reuter (2)
  Andreas D. Wieck (2)
  
  1. Experimental Physics and CeNIDE, University of Duisburg-Essen, 47058, Duisburg, Germany
  2. Chair of Solid-State Physics, Ruhr University Bochum, 44780, Bochum, Germany
  
• ISSN：1556-276X

文摘

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.