Spin-Charge Separation in Two-Dimensional Frustrated Quantum Magnets

Andreas Laeuchli (1, 2) , Didier Poilblanc (1, 2)

1 FFC - Fermions Fortement Corrélés (LPT)
2 LPT - Laboratoire de Physique Théorique

The dynamics of a mobile hole in two-dimensional frustrated quantum magnets is investigated by exact diagonalization techniques. Our results provide evidence for spin-charge separation upon doping the kagome lattice, a prototype of a spin liquid. In contrast, in the checkerboard lattice, a symmetry broken valence bond crystal, a small quasiparticle peak is seen for some crystal momenta, a finding interpreted as a restoration of weak holon-spinon confinement.

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

Andreas Laeuchli, Didier Poilblanc. Spin-Charge Separation in Two-Dimensional Frustrated Quantum Magnets. Physical Review Letters, 2004, 92 (23), pp.236404. ⟨10.1103/PhysRevLett.92.236404⟩. ⟨hal-00003114⟩