Entangled tetrahedron ground state and excitations of the magneto-electric skyrmion material Cu${}_2$OSeO${}_3$

Judit Romhányi, Jeroen van den Brink, Ioannis Rousochatzakis

The strongly correlated cuprate Cu${}_2$OSeO${}_3$ has recently been identified as the first insulating system exhibiting a skyrmion lattice phase. Using a microscopic multi-boson theo…