Importance of the Electronic State on the Electrode in Electron Tunneling Processes between the Electrode and the Quantum Dot

Masakazu MURAGUCHI
Yukihiro TAKADA
Shintaro NOMURA
Tetsuo ENDOH
Kenji SHIRAISHI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C    No.5    pp.563-568
Publication Date: 2010/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.563
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Fundamentals and Applications of Advanced Semiconductor Devices)
Category: Emerging Devices
Keyword: 
direct tunneling,  two-dimensional electron gas,  electron dynamics,  quantum dot,  electron transport,  

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Summary: 
We have revealed that the electronic states in the electrodes give a significant influence to the electron transport in nano-electronic devices. We have theoretically investigated the time-evolution of electron transport from a two-dimensional electron gas (2DEG) to a quantum dot (QD), where 2DEG represents the electrode in the nano-electronic devices. We clearly showed that the coherent electron transport is remarkably modified depending on the initial electronic state in the 2DEG. The electron transport from the 2DEG to the QD is strongly enhanced, when the initial state of the electron in the 2DEG is localized below the QD. We have proposed that controlling the electronic state in the electrodes could realize a new concept device function without modifying the electrode structures; that achieves a new controllable state in future nano-electronic devices.