376 citations · 3.8k across the 63 of their papers we have counts for
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Sixfold fermion near the Fermi level in cubic PtBi2
S. Thirupathaiah, Y. S. Kushnirenk, K. Koepernik +6
We show that the cubic compound PtBi2, is a topological semimetal hosting a sixfold band touching point in close proximity to the Fermi level. Using angle-resolved photoemission sp…
Dual topology in Jacutingaite PtHgSe
Jorge I. Facio, Sanjib Kumar Das, Yang Zhang +3
Topological phases of electronic systems often coexist in a material, well-known examples being systems which are both strong and weak topological insulators. More recently, a numb…
Strongly enhanced Berry dipole at topological phase transitions in BiTeI
Jorge I. Facio, Dmitri Efremov, Klaus Koepernik +3
Transitions between topologically distinct electronic states have been predicted in different classes of materials and observed in some. A major goal is the identification of measu…
Generic coexistence of Fermi arcs and Dirac cones on the surface of time-reversal invariant Weyl semimetals
Alexander Lau, Klaus Koepernik, Jeroen van den Brink +1
The hallmark of Weyl semimetals is the existence of open constant-energy contours on their surface -- the so-called Fermi arcs -- connecting Weyl points. Here, we show that for tim…
Experimental realization of type-II Weyl state in non-centrosymmetric TaIrTe
E. Haubold, K. Koepernik, D. Efremov +14
Recent breakthrough in search for the analogs of fundamental particles in condensed matter systems lead to experimental realizations of 3D Dirac and Weyl semimetals. Weyl state can…
Electronic structure of interfaces between hexagonal and rhombohedral graphite
M. Taut, K. Koepernik
The electronic structure including energy bands, band weights, and local density of states (LDOS) of interfaces between hexagonal (AB) and rhombohedral (ABC) graphite has been has…
Sub-nm wide electron channels protected by topology
Christian Pauly, Bertold Rasche, Klaus Koepernik +11
Helical locking of spin and momentum and prohibited backscattering are the key properties of topologically protected states. They are expected to enable novel types of information…
CoIr-carbon complexes with magnetic anisotropies larger than 0.2 eV: a density-functional-theory prediction
Ruijuan Xiao, Michael D. Kuz'min, Klaus Koepernik +1
We report a density-functional study of the heteronuclear CoIr dimer adsorbed on benzene or graphene. In either case CoIr prefers an upright position above the center of a carbon h…
Prediction of huge magnetic anisotropies of transition-metal dimer-benzene complexes
Ruijuan Xiao, Daniel Fritsch, Michael D. Kuz'min +4
Based on numerically accurate density functional theory (DFT) calculations, we systematically investigate the ground-state structure and the spin and orbital magnetism including th…