Magnon interactions in a moderately correlated Mott insulator.

ABSTRACT: Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO₂, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La₂CuO₄ indicate that quantum fluctuations are much stronger in SrCuO₂ s

SUBMITTER: Wang Q 

PROVIDER: S-EPMC11196644 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature