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Quantum Geometric Origin of the Intrinsic Nonlinear Hall Effect
Yannis Ulrich, Johannes Mitscherling, Laura Classen +1
We decompose the intrinsic second-order nonlinear Hall effect (NLHE) of a generic multiband system into its quantum-geometric contributions within a fully quantum-mechanical, proje…
Quantum geometry and low-frequency optical conductivity of nodal planes
Raymond Wiedmann, Kirill Alpin, Moritz M. Hirschmann +1
Nodal planes, two-dimensional symmetry-enforced band crossings, can carry a topological charge, similar to Weyl points. While the transport properties of Weyl points are well under…
Callan-Rubakov effects in topological insulators
Yusuke O. Nakai, Reuel Dsouza, Daichi Nakamura +3
The Callan-Rubakov effect describes monopole-catalyzed proton decay. While this effect is fundamental for quantum field theories, its experimental observation has remained far from…
Topological responses from gapped Weyl points in 2D altermagnets
Kirill Parshukov, Raymond Wiedmann, Andreas P. Schnyder
We study the symmetry requirements for topologically protected spin-polarized Weyl points in 2D altermagnets. The topology is characterized by a quantized -Berry phase and the d…
Generalized Fermion Doubling Theorems: Classification of 2D Nodal Systems in Terms of Wallpaper Groups
Congcong Le, Zhesen Yang, Fan Cui +2
The Nielsen-Ninomiya Theorem has set up a ground rule for the minimal number of the topological points in a Brillouin zone. Notably, in the 2D Brillouin zone, chiral symmetry and s…
Berry curvature-induced local spin polarisation in gated graphene/WTe heterostructures
Lukas Powalla, Jonas Kiemle, Elio J. König +6
Full experimental control of local spin-charge interconversion is of primary interest for spintronics. Heterostructures combining graphene with a strongly spin-orbit coupled two-di…