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Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 21: Electronic Structure and Spin-Orbit Interaction I

O 21.11: Talk

Monday, March 11, 2013, 18:30–18:45, H42

Dirac-cone-like surface state in W(110): Dispersion, spin texture, and photoemission from first principlesHossein Mirhosseini1, •Markus Flieger2, and Jürgen Henk21Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2Martin-Luther-Universität Halle-Wittenberg, Halle, Germany

We report on a theoretical study of a dz2 surface state at the tungsten (110) surface, addressing in detail the spin-resolved electronic structure as well as photoemission spectroscopy. In agreement with recent experiments [1], this surface state shows a strongly anisotropic dispersion: In the HΓH direction of the surface Brillouin zone, it disperses linearly but becomes flattened along the NΓN direction. The ab initio calculated spin texture agrees with the one derived from a model Hamiltonian; due to two-fold surface symmetry and time-reversal symmetry, the out-of-plane spin polarization vanishes. The photoemission intensities depend sensitively on the polarization of the incident light, because of the orbital composition of the surface state. The photoelectrons become spin-polarized out-of-plane, which is attributed to breaking the time-reversal symmetry by the excitation process.

[1] K. Miyamoto et alii, Phys. Rev. Lett. 108 (2012) 066808; eidem, Phys. Rev. B 86 (2012) 161411(R).

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