2012 Fiscal Year Final Research Report
Quasi-particle interference in a spin-split surface band and its application to spin filters
| Project/Area Number |
22360019
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HIRAYAMA Hiroyuki 東京工業大学, 大学院・総合理工学研究科, 教授 (60271582)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Yuki 東京工業大学, 大学院・総合理工学研究科, 助教 (60514271)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 表面 |
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| Research Abstract |
We investigated electronic states of the Bi/Ag(111)√3x√3 surfaces using STM-based dI/dV imaging and STS spectrum measurements. The surface states were confirmed to be spin-splitted by observing a characteristic peak in STS. The spin-splitted surface band electrons were suffered intra-band scattering at surface steps to induced quasi-particle interference (i.e. surface electron standing wave pattern in dI/dV images). The energu dependence of the wavelength of the interference pattern enabled us to deduce the averaged surface band dispersion of the paired spin-splitted surface bands. In addition, we found a novel surface reconstruction of Bi/Ag(111) surface at a higher Bi coverage, surfactant effect of Bi on the Ag growth on the Bi/Ag(111)√3x√3 surfaces, and a relation between the randomly adsorbed Bi atoms and the life time of the surface state electrons.
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