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Dirac and Weyl semimetals

Subject Area Experimental Condensed Matter Physics
Term from 2016 to 2020
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 290387256
 
Final Report Year 2020

Final Report Abstract

We have studied the electronic structure of many materials hosting Dirac and Weyl states. We have obtained new and surprising results leading to discovery of several Dirac and Weyl semimetals. Among them are the magnetic type-II Weyl semimetal YbMnBi2, noncetrosymmetric type-II Weyl semimetal TaIrTe4 with minimal number of Weyl points, strongly correlated superconductor Fe-Se-Te with polytypic 3D-Dirac points, basic Z2 topological semimetal GaGeTe, non-magnetic half-metal IrBiSe, several structural modifications of PtBi2 hosting triple Dirac points and superconductivity. Many of the topological materials found have great application potential. ARPES experiments carried out during the project led to the invention of a new type of electron spectrometer which allows the fastest high-resolution mapping of the Fermi surface, in particular of the topological semimetals. First measurements of the Fermi surface of topological insulator Bi2Te3 demonstrate the potential of this novel approach.

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