Spinon deconfinement in doped frustrated quantum antiferromagnets

Didier Poilblanc (1, 2, 3) , Andreas Laeuchli (4) , Matthieu Mambrini (1, 3) , Frederic Mila (2)

1 FFC - Fermions Fortement Corrélés (LPT)
2 Institute of Theoretical Physics
3 LPT - Laboratoire de Physique Théorique
4 IRRMA - Institut Romand de Recherche Numerique en Physique des Materiaux

The confinement of a spinon liberated by doping frustrated quantum two-dimensional Heisenberg antiferromagnets with a non-magnetic impurity is investigated. For a static impurity, an intermediate behaviour between complete deconfinement (kagome) and strong confinement (checkerboard) is identified, with a spinon confinement length significantly larger than the short magnetic correlation length of the host and a reduced Z factor (J1-J2-J3 model on the square lattice). This translates into an extended spinon-holon boundstate for mobile vacancies, allowing one to relate features of the hole spectral function measured by ARPES to features accessible in real space by NMR experiments on impurity-doped systems.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Didier Poilblanc, Andreas Laeuchli, Matthieu Mambrini, Frederic Mila. Spinon deconfinement in doped frustrated quantum antiferromagnets. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 73 (10), pp.100403. ⟨10.1103/PhysRevB.73.100403⟩. ⟨hal-00005756⟩