Effects of semiclassical spiral fluctuations on hole dynamics

Abstract

We investigate the dynamics of a single hole coupled to the spiral fluctuations related to the magnetic ground states of the antiferromagnetic J_1-J_2-J_3 Heisenberg model on a square lattice. Using exact diagonalization on finite size clusters and the self consistent Born approximation in the thermodynamic limit we find, as a general feature, a strong reduction of the quasiparticle weight along the spiral phases of the magnetic phase diagram. For an important region of the Brillouin Zone the hole spectral functions are completely incoherent, whereas at low energies the spectral weight is redistributed on several irregular peaks. We find a characteristic value of the spiral pitch, Q=(0.7,0.7)π, for which the available phase space for hole scattering is maximum. We argue that this behavior is due to the non trivial interference of the magnon assisted and the free hopping mechanism for hole motion, characteristic of a hole coupled to semiclassical spiral fluctuations.

6 pages, 5 figures

References in corpus (5)

• Quantum Phases of the Planar Antiferromagnetic J_1-J_2-J_3 Heisenberg-Model
• Low temperature broken symmetry phases of spiral antiferromagnets
• Spin-Charge Separation in Two-dimensional Frustrated Quantum Magnets
• Spinon deconfinement in doped frustrated quantum antiferromagnets
• Spin polaron in the J1-J2 Heisenberg model

Cited by in corpus (4)

• Generalized one-band model based on Zhang-Rice singlets for Tetragonal CuO
• Magnon-assisted dynamics of a hole doped in a cuprate superconductor
• Broken discrete and continuous symmetries in two dimensional spiral antiferromagnets
• The fate of pairing and spin-charge separation in the presence of long-range antiferromagnetism