Valence-bond solid to antiferromagnet transition in the two-dimensional Su-Schrieffer-Heeger model by Langevin dynamics
Anika Götz, Stefan Beyl, Martin Hohenadler, Fakher F. Assaad
Abstract
Electron-phonon coupling is typically not associated with magnetic order but with either charge density waves (patterns of high and low electron density) or valence-bond solids (patterns of strong and weak electronic bonds). Using quantum Monte Carlo simulations, the authors demonstrate that, within the paradigmatic two-dimensional Su-Schrieffer-Heeger model, the electron-phonon interaction favors antiferromagnetic order in large regions of the phase diagram. A valence-bond solid is observed in the adiabatic regime, while the two phases are connected by an apparently direct phase transition.
Topics & Concepts
Condensed matter physicsValence bond theoryAntiferromagnetismPhononValence (chemistry)Adiabatic processPhase diagramPhysicsElectronPhase transitionQuantum Monte CarloBond orderChemistryMonte Carlo methodPhase (matter)Bond lengthQuantum mechanicsMoleculeAtomic orbitalMathematicsStatisticsPhysics of Superconductivity and MagnetismQuantum and electron transport phenomenaAdvanced Condensed Matter Physics