Triplet nodal lines and Chern bands in XCuCl${}_3$ (X= K, Tl)

Charles B. Walker, Matthew Stern, Judit Romhányi

We investigate the symmetry-enforced line nodes of the triplet excitations of XCuCl${}_3$ (X= K, Tl), showing that they are protected by the nonsymmorphic symmetries and are unaffe…