Quasi-particle interference in a spin-split surface band and its application to spin filters

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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.