Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Poster: Topological Insulators (HL jointly with MA, O)
O 87.2: Poster
Donnerstag, 3. April 2014, 17:00–20:00, P1
Dirac and Weyl semimetal states in Na3Bi from first principles — •Patrick Buhl, Stefan Blügel, and Yuriy Mokrousov — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
Recently,
the three-dimensional Dirac semimetal state was theoretically predicted
to exist [1] and experimentally observed [2] in bulk Na3Bi. Using first principles methods in combination with the Wannier functions technique [3], we construct and analyze the topological phase diagram of Na3Bi as a
function of
spin-orbit strength and external exchange field. In particular we aim at
realization
of the Weyl semimetal phase in this material. The topological properties are characterized in terms of what computed from ab initio Chern and spin Chern numbers of the Berry curvature flux around the points of band degeneracy.
Additionally,
we consider finite slabs of Na3Bi and focus on the electronic
structure
of the surface states in correlation to the bulk topological phase
diagram.
Financial support by the HGF-YIG Programme VH-NG-513 is gratefully
acknowledged.
[1] Z. Wang et al., Phys. Rev. B 85, 195320 (2012)
[2] Z.K. Liu et al., arXiv:1310.0391 (2013)
[3] www.flapw.de