Spinon deconfinement in doped frustrated quantum antiferromagnets

Abstract

The confinement of a spinon liberated by doping two-dimensional frustrated quantum antiferromagnets with a non-magnetic impurity or a mobile hole is investigated. For a static vacancy, an intermediate behavior between complete deconfinement (kagome) and strong confinement (checkerboard) is identified in the J_1{-}J_2{-}J_3 model on the square lattice, with the emergence of two length scales, a spinon confinement length larger than the magnetic correlation length. For mobile holes, this translates into an extended spinon-holon boundstate allowing one to bridge momentum (ARPES spectral function) and real space (STM) experimental observations. These features provide clear evidence for a nearby "deconfined critical point" in a doped microscopic model.

arXiv commentRevised manuscript -- Ref. 26 added

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• Quantum spin correlations in an organometallic alternating sign chain
• Confinement and Deconfinement of Spinons in Two Dimensions
• Impurity-doped Kagome Antiferromagnet: A Quantum Dimer Model Approach
• Magnetism in the 2D Limit and Interface Superconductivity in Metal-Insulator La(2-x)Sr(x)CuO(4) Superlattices
• Quantum magnets with weakly confined spinons: Multiple length scales and quantum impurities
• Plaquette bond order wave in the quarter-filled extended Hubbard model on the checkerboard lattice
• Unconventional Superconducting Symmetry in a Checkerboard Antiferromagnet
• Quantum half-orphans in kagome antiferromagnets
• Deconfinement criticality for the spatially anisotropic triangular antiferromagnet with the ring exchange
• Deconfined Quantum Critical Point: A Review of Progress
• Deconfined criticality for the S=1 spin model on the spatially anisotropic triangular lattice
• Neel-VBS phase boundary of the extended J_1-J_2 model with biquadratic interaction
• Effects of semiclassical spiral fluctuations on hole dynamics
• Static Holes in the Geometrically Frustrated Bow Tie Ladder
• Exotic phenomena in doped quantum magnets
• The fate of the spin polaron in the 1D antiferromagnets
• Deconfined-critical behavior of the VBS- and nematic-order parameters for the spatially anisotropic S=1-spin model
• Single-hole spectral functions in one-dimensional quantum magnets with different ground states
• $XY$-VBS phase boundary for the square-lattice $J_1$-$J_2$ $XXZ$ model with the ring exchange