Spinon deconfinement in doped frustrated quantum antiferromagnets

The confinement of a spinon liberated by doping two-dimensional frustrated quantum antiferromagnets with a nonmagnetic 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 J1–J2–J3 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 (angular-resolved photoemission spectroscopy spectral function) and real-space (scanning tunneling microscopy) experimental observations. These features provide clear evidence for a nearby “deconfined critical point” in a doped microscopic model.


Published in:
Physical Review B, 73, 10, 100403
Year:
2006
Laboratories:


Note: The status of this file is: Anyone


 Record created 2019-06-24, last modified 2020-04-20

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