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.

Revised manuscript -- Ref. 26 added

References in corpus (3)

• "Deconfined" quantum critical points
• Low temperature broken symmetry phases of spiral antiferromagnets
• Spin-Charge Separation in Two-dimensional Frustrated Quantum Magnets

Cited by in corpus (13)

• Evidence for deconfined quantum criticality in a two-dimensional Heisenberg model with four-spin interactions
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• Dzyaloshinskii-Moriya anisotropy and non-magnetic impurities in the $s=1/2$ kagome system ZnCu_3(OH)_6Cl_2
• Quantum spin correlations in an organometallic alternating sign chain
• Impurity-doped Kagome Antiferromagnet: A Quantum Dimer Model Approach
• 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
• Deconfinement criticality for the spatially anisotropic triangular antiferromagnet with the ring exchange
• Deconfined Quantum Critical Point: A Review of Progress
• The fate of the spin polaron in the 1D antiferromagnets
• $XY$-VBS phase boundary for the square-lattice $J_1$-$J_2$ $XXZ$ model with the ring exchange
• Single-hole spectral functions in one-dimensional quantum magnets with different ground states