2007 Fiscal Year Final Research Report Summary
Control of electrons and holes by quantum rings and related nanostructures and its device applications
| Project/Area Number |
17206034
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | Toyota Technological Institute (2006-2007)
The University of Tokyo (2005) |
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Principal Investigator |
SAKAKI Hiroyuki Toyota Technological Institute, School of Engineering, Professor (90013226)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAKAWA Kazuhiko University of Tokyo, Institute of Industrial Science, Professor (10183097)
AKIYAMA Hidefumi University of Tokyo, Institute for Solid State Physics, Assistant Professor (40251491)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Quantum rings / Semiconductor nanostructures / GaSb / TYpe II heterostructures / Quantum confinement / InAs / Quantum dots / Quantum rods |
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| Research Abstract |
To expand the forefront of nanoelectronics research, we have explored potentials of quantum ring (QR) structures in parallel with quantum dots (QDs), rods, and wires. Attentions have been focused mainly on type II GaSb based nanostructures, where holes are selectively confined, while electrons are driven outside. Two schemes for the self-organized formation of (GaAl)Sb QRs have been studied; in one scheme, ring-shaped quantum states of holes are formed, whereas electrons are confined in ring-like orbits just outside a positively charged GaSb QD in the other. A possibility to generate multi-pole radiations by making use of QR states has been proposed and analyzed. A new photodetector device has been proposed and realized, in which photo-generated holes are trapped by GaSb holes and modulate the current flow through a near bye channel. In addition, we have demonstrated a unique scheme to align InGaAs QDs along multi-atomic steps of about 20-40nm in periodicity and also novel single-electron transistors based on tiny electrodes attached to an individual InAs QD.
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Research Products
(89 results)
