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The dynamics of a mobile hole in two-dimensional (2D) frustrated
quantum magnets which can be observed by ARPES is investigated by Lanczos techniques. Our results provide evidences for spin-charge separation under doping the Kagome lattice, a prototype of spin liquid. On the contrary, in the checkerboard lattice, a candidate of broken-symmetry Valence Bond Crystal, a small quasi-particle peak is seen for some crystal momenta, a finding interpreted as a restoration of weak holon-spinon confinement. Recent progress regarding the search for a deconfinement phenomenon in the
doped 2D J1-J2-J3 Heisenberg model will also be discussed.
Reference: A. Laeuchli & D.P., Phys. Rev. Lett. 92, 236404 (2004). |