Noncoplanar orders and quantum disordered states in maple-leaf antiferromagnets
arxiv(2024)
摘要
A promising route towards the realization of chiral spin liquids is the
quantum melting of classically noncoplanar spin states via quantum
fluctuations. In the classical realm, such noncoplanar orders can effectively
be stabilized by interactions beyond nearest neighbors. Motivated by the recent
synthesis of materials with a maple-leaf lattice geometry, we study the effect
of cross-plaquette couplings on elementary Heisenberg antiferromagnets for this
geometry. We find a rich spectrum of noncoplanar states, including a novel
icosahedral order as well as incommensurate spin spirals, using large-scale
Monte Carlo simulations in combination with a semi-analytical analysis. To
inspect the potential quantum melting of these states, we analyze the quantum
S = 1/2 variant of these models using pseudo-fermion functional
renormalization group (pf-FRG) simulations. Notably, we indeed find extended
parameter regimes lacking long-range magnetic order – in regions classically
occupied by noncoplanar orders – which we putatively identify with the
possible formation of chiral quantum spin liquids.
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