Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 33: Transport: Topological Semimetals 2 (jointly with MA/TT)

DS 33.5: Vortrag

Mittwoch, 22. März 2017, 16:00–16:15, HSZ 204

Emergent Weyl fermion bulk excitations in TaP evidenced from 181Ta quadrupole resonanceH. Yasuoka1,2, T. Kubo1,3, Y. Kishimoto1,3, D. Kasinathan1, M. Schmidt1, B. Yan1, Y. Zhang4, H. Tou3, C. Felser1, A.P. Mackenzie1,5, and •M. Baenitz11MPI for Chemical Physics of Solids, 01187 Dresden, Germany — 2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan — 3Department of Physics, Graduate school of Science, Kobe University, Kobe, Japan — 4IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 5SUPA, School of Physics & Astronomy, University of St. Andrews, UK

The monophosphite TaP has a non centrosymmetric structure and sizable spin orbit coupling and belongs the class of Weyl semimetals. A crossing of lineare dispersive (Ek) topologically protected polarized bands in a single point in reciprocal space defines the Weyl node where the fermion mass vanishes theoretically and a giant orbital hyperfine coupling is expected [1]. 181Ta quadrupole resonance (NQR) resolves three NQR lines associated to the split level transitions for I=7/2 Ta. The spin lattice relaxation was measured for the ±5/2 ↔ ±3/2 transition. Above 30 K, a pronounced (1/T1T) ∝ T2 is found. We attributed this to the magnetic excitations of Weyl fermions (N(E) ∝ E2) with temperature dependent orbital hyperfine coupling in agreement with the prediction from theory [1].

[1] Z. Okvatovity et al., arXiv:1609.3370v1

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