Koichiro Yaji

Large Rashba spin splitting of a metallic surface-state band on a semiconductor surface

The generation of spin-polarized electrons at room temperature is an essential step in developing semiconductor spintronic applications. To this end, we studied the electronic states of a Ge(111) surface, covered with a lead monolayer at a fractional coverage of 4/3, by angle-resolved photoelectron spectroscopy (ARPES), spin-resolved ARPES and first-principles electronic structure calculation. We demonstrate that a metallic surface-state band with a dominant Pb 6p character exhibits a large Rashba spin splitting of 200u2009meV and an effective mass of 0.028 me at the Fermi level. This finding provides a material basis for the novel field of spin transport/accumulation on semiconductor surfaces. Charge density analysis of the surface state indicated that large spin splitting was induced by asymmetric charge distribution in close proximity to the nuclei of Pb atoms.

Electronic structure of Cr1-δX(X=S, Te) studied by Cr 2p soft x-ray magnetic circular dichroism

Cr

Structure determination of Bi/Ge(111)- by dynamical low-energy electron diffraction analysis and scanning tunneling microscopy

2p

Soft x-ray magnetic circular dichroism study of Cr tellurides

core excited x-ray absorption and x-ray magnetic circular dichroism (XMCD) spectra of ferromagnetic

A NEGATIVE SPIN-POLARIZATION STRUCTURE OF Ni(110): PROBED BY SPIN- AND ANGLE-RESOLVED PHOTOELECTRON SPECTROSCOPY

{mathrm{Cr}}_{1text{penalty1000-hskip0pt}ensuremath{delta}}mathrm{Te}

Determination of the orbital polarization in YTiO3 by using soft X-ray linear dichroism.

with several concentrations of

Mn 2p-3d soft X-ray magnetic circular dichroism study of Mn5Ge3

ensuremath{delta}=0.11--0.33

Temperature dependent quantum well state on Cu(1 1 0)(2 × 1) striped surface studied by angle resolved photoelectron spectroscopy

and ferrimagnetic

Surface quantum well state at the striped Cu(110)(2 × 1)O surface studied by angle resolved photoemission spectroscopy

{mathrm{Cr}}_{5}{mathrm{S}}_{6}

Photoelectron spectroscopy and soft X-ray absorption spectroscopy of pyrochlore molybdenum oxides R2Mo2O7 (R=Sm, Tb)

have been measured. The observed XMCD line shapes are found to very weakly depend on