2011 Fiscal Year Final Research Report

Study of quantum coherence in multiple system utilizing multi single-lead quantum dots

Research Project

Project/Area Number	22810008
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Single-year Grants
Research Field	Nanostructural science
Research Institution	The University of Tokyo
Principal Investigator	OTSUKA Tomohiro 東京大学, 大学院・工学系研究科, 研究員 (50588019)
Project Period (FY)	2010 – 2011
Keywords	量子ドット / 量子細線 / 量子ホール効果 / メゾスコピック系 / スピン偏極 / マイクロ・ナノデバイス
Research Abstract	We have demonstrated experiments relating multiple quantum systems utilizing semiconductor nano structures. We measured relaxation in quantum Hall edge states, which are important components of multiple quantum systems, with quantum point contacts and discussed about the relaxation mechanisms. We also developed a new method to detect local spin polarization in semiconductor nano structures, which is essential in spin related quantum systems, by using single-lead quantum dots and confirmed its operation. With this new method, we probed local spin polarization formed in quantum Hall edge states.