Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 88: Electronic Structure: Surface Magnetism and Spin Phenomena
O 88.8: Talk
Thursday, March 19, 2015, 16:45–17:00, MA 042
Orbital-selective spin characterization of Dirac-cone-like surface state at W(110) — •Koji Miyamoto1, Henry Wortelen1, Hossein Mirhosseini3, Jürgen Henk4, Taichi Okuda2, and Markus Donath1 — 1WWU Münster, Germany — 2Hiroshima Univ., Japan — 3JGU Mainz, Germany — 4MLU Halle, Germany
Recently, for the topological surface state (TSS) of Bi2Se3, several groups have observed an interesting phenomenon by spin- and angle-resolved photoemission (SARPE): the observed spin features of the photoelectrons are strongly dependent on the light polarization [1,2]. This effect is currently highly debated in the field of optospintronics. So far, the observations are limited to surfaces with C3v symmetry.
The surface of W(110) shows a spin-polarized Dirac-cone-like state within a spin-orbit-induced gap, which is reminiscent of a TSS [3]. Here, in contrast to so far studied topological insulators, the surface structure has C2v symmetry.
We studied the orbital dependence of the spin feature of the Dirac-cone-like surface state along Γ H at W(110) by using SARPE with s- and p-polarized light. The observed spin textures are found to be reversed between even and odd orbital symmetry. This finding opens a new way to manipulate the spin polarization of photoelectrons in systems with C2v symmetry.
[1] C. Jozwiak et al., Nat., Phys. 9, 293 (2013).
[2] Z. Xie et al., Nat., Commun. 5, 3382 (2013).
[3] K. Miyamoto et al., Phys. Rev. Lett. 108, 066808 (2012).