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Interaction effects on the classification of crystalline topological insulators and superconductors
Xue-Yang Song, Andreas P. Schnyder
We classify interacting topological insulators and superconductors with order-two crystal symmetries (reflection and twofold rotation), focusing on the case where interactions redu…
Quasiparticle interference from different impurities on the surface of pyrochlore iridates: signatures of the Weyl phase
F. Lambert, A. P. Schnyder, R. Moessner +1
Weyl semimetals are gapless three-dimensional topological materials where two bands touch at an even number of points in the bulk Brillouin zone. These semimetals exhibit topologic…
Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd
H. M. Benia, E. Rampi, C. Trainer +12
Materials with strong spin-orbit coupling (SOC) have in recent years become a subject of intense research due to their potential applications in spintronics and quantum information…
Type-II Dirac surface states in topological crystalline insulators
Ching-Kai Chiu, Y. -H. Chan, Xiao Li +2
We study the properties of a family of anti-pervoskite materials, which are topological crystalline insulators with an insulating bulk but a conducting surface. Using ab-initio DFT…
Nonsymmorphic symmetry-required band crossings in topological semimetals
Y. X. Zhao, Andreas P. Schnyder
We show that for two-band systems nonsymmorphic symmetries may enforce the existence of band crossings in the bulk, which realize Fermi surfaces of reduced dimensionality. We find…
Scaling Theory of Topological Invariants
Wei Chen, Manfred Sigrist, Andreas P. Schnyder
For inversion-symmetric topological insulators and superconductors characterized by topological invariants, two scaling schemes are proposed to judge topological…