2016 Fiscal Year Final Research Report
Energy conversion on a quantum nano-device in a phonon resonator
| Project/Area Number |
15K13271
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nanostructural physics
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Research Collaborator |
SATO Yuya
TAKASU Ryo
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | フォノン共振器 / 量子ドット / 共振器電気力学 |
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| Outline of Final Research Achievements |
We have conducted a research on energy conversion between a semiconductor phonon system and an electronic system. Particularly an electron-phonon hybrid system is developed with a semiconductor double quantum dot in a surface-acoustic-wave phonon resonator. The device was fabricated by patterning a metal layer on the surface. Firstly, we evaluated fundamental acoustic characteristics such as the phonon band gap and resonator modes by using time-, frequency-, and space-resolved measurements for piezoelectric potential. Phonon scattering rate in the resonator is significantly enhanced by a factor of about 80, which can be enhanced further by optimizing the structure. Moreover we find novel spin-flip phonon assisted tunneling in the Pauli spin blockade regime. Intriguingly, this tunneling process probes Rabi splitting associated with coherent coupling between electron and phonon systems. The results encourage further development towards phonon version of cavity quantum electrodynamics.
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| Free Research Field |
半導体量子輸送
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