Valence-Bond Order in a Honeycomb Antiferromagnet Coupled to Quantum Phonons
arXiv:2009.12393 · doi:10.1103/PhysRevB.103.L041105
Abstract
We use exact quantum Monte Carlo simulations to demonstrate that the Néel ground state of an antiferromagnetic SU(2) spin- Heisenberg model on the honeycomb lattice can be destroyed by a coupling to quantum phonons. We find a clear first-order transition to a valence-bond-solid state with Kekulé order instead of a deconfined quantum critical point. However, quantum lattice fluctuations can drive the transition towards weakly first-order, revealing a tunability of the transition by the retardation of the interaction. In contrast to the one-dimensional case, our phase diagram in the adiabatic regime is qualitatively different from the frustrated - model. Our results suggest that a coupling to bond phonons can induce Kekulé order in Dirac systems.
arXiv comment7 pages, 4 figures
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