Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

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

DS 33.3: Talk

Wednesday, March 22, 2017, 15:30–15:45, HSZ 204

Experimental observation of type-II Weyl states in TaIrTe₄ — •Erik Haubold¹, Klaus Koepernik¹, Dmitriy Efremov¹, Seunghyun Khim², Alexander Fedorov^1,3, Yevhen Kushnirenko¹, Jeroen van den Brink^1,4, Sabine Wurmehl^1,4, Bernd Büchner^1,4, Timur Kim⁵, Moritz Hoesch⁵, Kazuki Sumida⁶, Kazuaki Taguchi⁶, Tomoki Yoshikawa⁶, Akio Kimura⁶, Taichi Okuda⁷, and Sergey Borisenko¹ — ¹IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — ²MPI CPfS, 01187 Dresden, Germany — ³II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany — ⁴Department of Physics, TU Dresden, 01062 Dresden, Germany — ⁵Diamond Light Source, Didcot OX11 0DE, United Kingdom — ⁶Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan — ⁷Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan

Weyl semimetals have raised a lot of interest lately due to their interesting exotic surface states. TaIrTe₄, belonging to the recently introduced class of type-II Weyl semimetals, hosts 4 Weyl points. These are well separated in the Brillouin zone and connected by rather long and parralel Fermi Arcs, making the material especially interesting for further research and future applications. In this work we find direct correspondence between theoretical predictions and ARPES results for both bulk and the surface states. Remarkably, these surface states are spin polarized, highlighting the potential for novel applications.