High-Tc superconductivity, skyrmions, and the Berry phase
B. Basu, S. Dhar, P. Bandyopadhyay
DOI 10.1103/PhysRevB.69.094505 · Physical Review B
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Abstract
It is here pointed out that the antiferromagnetic spin fluctuation may be associated with a gauge field which gives rise to the antiferromagnetic ground-state chirality. This is associated with the chiral anomaly and Berry phase when we consider the two-dimensional (2D) spin system on the surface of a 3D sphere with a monopole at the center. This realizes the resonating valence bond (RVB) state where spinons and holons can be understood as chargeless spins and spinless holes attached with magnetic flux. The attachment of the magnetic flux to a charge carrier suggests that this may be viewed as a skyrmion. The interaction of a massless fermion representing a neutral spin with a gauge field along with the interaction of a spinless hole with the gauge field enhances the antiferromagnetic correlation along with the pseudogap at the underdoped region. As the doping increases the antiferromagnetic long-range order disappears for the critical doping parameter δsc. In this framework, the superconducting pairing may be viewed as caused by skyrmion-skyrmion bound states.
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