Magnetic field induced topological nodal-lines in triplet excitations of frustrated antiferromagnet CaV${}_4$O${}_9$

Moumita Deb, Asim Kumar Ghosh

Magnetic field induced multiple non-Dirac nodal-lines are found to emerge in the triplet dispersion bands of a frustrated spin-1/2 antiferromagnetic model on the CaVO lattice. Plaq…