K
K. Koepernik
Researcher at Leibniz Association
Publications - 39
Citations - 1643
K. Koepernik is an academic researcher from Leibniz Association. The author has contributed to research in topics: Fermi level & Weyl semimetal. The author has an hindex of 18, co-authored 39 publications receiving 1417 citations. Previous affiliations of K. Koepernik include Leibniz Institute for Solid State and Materials Research & Leibniz Institute for Neurobiology.
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Problems with reconciling density functional theory calculations with experiment in ferropnictides
TL;DR: In this article, the authors present a systematic analysis using four different first-principles methods and show that well-converged full-potential all-electron results are fully consistent among themselves.
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Orbital textures and charge density waves in transition metal dichalcogenides
T. Ritschel,T. Ritschel,J. Trinckauf,K. Koepernik,Bernd Büchner,Bernd Büchner,Martin v. Zimmermann,Helmuth Berger,Young Il Joe,Peter Abbamonte,Jochen Geck +10 more
TL;DR: A theoretical and experimental study revealed the relation between charge density waves and orbital textures for different stackings in a two-dimensional layered material as mentioned in this paper, and showed that charge density wave and orbital texture can be correlated.
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TaIrTe 4 : A ternary type-II Weyl semimetal
K. Koepernik,Deepa Kasinathan,D. V. Efremov,Seunghyun Khim,Sergey Borisenko,Bernd Büchner,Jeroen van den Brink,Jeroen van den Brink +7 more
TL;DR: In this article, the authors identify a third member of this family of topological semimetals as a third class of Weyl points, named TaIrTe, which is a type-II Weyl semimetal.
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Experimental realization of type-II Weyl state in noncentrosymmetric TaIrTe 4
Erik Haubold,K. Koepernik,D. V. Efremov,Seunghyun Khim,Alexander Fedorov,Yevhen Kushnirenko,J. van den Brink,Sabine Wurmehl,Bernd Büchner,Timur K. Kim,Moritz Hoesch,Kazuki Sumida,Kazuaki Taguchi,Tomoki Yoshikawa,Akio Kimura,Taichi Okuda,Sergey Borisenko +16 more
TL;DR: In this article, the authors present experimental evidence for a type-II noncentrosymmetric Weyl semimetal with spin polarization in the direction along the Fermi arcs connecting four Weyl points.
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LSDA + U versus LSDA: Towards a better description of the magnetic nearest-neighbor exchange coupling in Co- and Mn-doped ZnO
TL;DR: In this paper, the magnetic interactions between two nearest-neighbor substitutional magnetic ions (Co or Mn) were calculated by means of density functional theory and compared with the available experimental data.