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TT: Fachverband Tiefe Temperaturen

TT 29: Frustrated Magnets: General

TT 29.12: Talk

Wednesday, March 29, 2023, 12:30–12:45, HSZ 201

Another exact ground state of a 2D quantum antiferromagnet — Pratyay Ghosh, •Tobias Müller, Jannis Seufert, and Ronny Thomale — Julius-Maximilians-Universität, Würzburg, Germany

We present the exact dimer ground state of a quantum antiferromagnet on the maple-leaf lattice. A coupling anisotropy for one of the three inequivalent nearest-neighbor bonds is sufficient to stabilize the dimer state. Together with the Shastry-Sutherland Hamiltonian, we show that this is the only other model with an exact dimer ground state for all two-dimensional lattices with uniform tilings. We futhermore discuss the stability of this ground state from the perspective of perturbation theory.