Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 67: Electronic structure of surfaces: Spectroscopy, surface states III

O 67.9: Talk

Wednesday, March 14, 2018, 17:30–17:45, MA 042

First-principles calculations on the surface states of KHgSb: hourglass fermions — •Ji Hoon Ryoo and Cheol-Hwan Park — Department of Physics & Astronomy, Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

It has been recently proposed [1] and experimentally confirmed [2] that exotic surface states reside in the surface of KHgSb, so-called hourglass fermions named after their peculiar energy band structure. In this contribution, we present the results of our comprehensive first-principles study on the electronic structure of KHgSb surface and bulk. Especially, we highlight the role of spin-orbit coupling and symmetry on the spin texture of these hourglass fermions.

[1] Z. Wang, A. Alexandradinata, R. J. Cava, B. A. Bernevig, Nature 532, 189 (2016).

[2] J. Ma et al., Science Advances 3, e1602415 (2017).