Non-collinear ground state from a four-spin chiral exchange in a tetrahedral magnet

I. A. Ado, O. Tchernyshyov, M. Titov

We propose a quartic chiral term $m_x{m}_y{m}_z\nabla \cdot \mathbf{m}$ for the energy density of a cubic ferromagnet with broken parity symmetry (point group $T_d$). We demonstrate…