Magnetization of the Exact Ground State of the Maple-leaf Model

The quantum antiferromagnet on the maple-leaf lattice realizes an exact dimer ground state with coupling anisotropy for one of the three inequivalent nearest-neighbor bonds. Together with the Shastry-Sutherland Hamiltonian, this is the only other model with an exact dimer ground state for all two-dimensional lattices with uniform tilings. We present its response to an external magnetic field. Performing a strong-coupling expansion, we arrive at an effective bosonic Hamiltonian for the magnetic particle interactions, which allows us to predict several novel magnetization plateaus. We also describe how the structure of the lattice affects the dynamical behavior of these magnetic excitations, leading to the condensation of multi-particle bound states and the emergence of very low magnetizations.