Spin-polarized Dirac-cone-like surface state with $d$ character at W(110)

Abstract

The surface of W(110) exhibits a Dirac-cone-like surface state with $d$ character within a spin-orbit-induced symmetry gap. As a function of wave vector parallel to the surface, it shows nearly massless energy dispersion and a pronounced spin polarization, which is antisymmetric with respect to the Brillouin zone center. In addition, the observed constant energy contours are strongly anisotropic for all energies. This discovery opens new pathways to the study of surface spin-density waves arising from a strong Fermi surface nesting as well as $d$-electron-based topological properties.

4 pages, 3 figures, accepted for publication in Phys. Rev. Lett

References in corpus (2)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Quantum spin Hall effect in a transition metal oxide Na2IrO3

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