Honeycomb antiferromagnet with a triply degenerate dimer ground state

  title={Honeycomb antiferromagnet with a triply degenerate dimer ground state},
  author={Rakesh Kumar and Dushyant Kumar and Brijesh Kumar},
  journal={Physical Review B},
We present an antiferromagnetic quantum spin-1/2 model on honeycomb lattice. It has two parts, one of which is the usual nearest-neighbor Heisenberg model. The other part is a certain multiple spin interaction term, introduced by us, which is exactly solvable for the ground state. Without the Heisenberg part, the model has an exact threefold degenerate dimer ground state. This exact ground state is also noted to exist for the general spin-$S$ case. For the spin-1/2 case, we further carry out… 
6 Citations

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* Electronic address: rakesh.phys@gmail.com † Electronic address: bkumar@mail.jnu.ac