Spontaneous Vortex Phase in the Bosonic RVB Theory
Z. Y. Weng, V. N. Muthukumar
Abstract
In the description of spin-charge separation based on the phase string theory of the t-J model, spinon excitations are vortices in the superconducting state. Thermally excited spinons destroy phase coherence, leading to a new phase characterized by the presence of free spinon vortices at temperatures, Tc<T<Tv. The temperature scale Tv at which holon condensation occurs marks the onset of pairing amplitude, and is related to the spin pseudogap temperature T*. The phase below Tv, called the spontaneous vortex phase, shows novel transport properties before phase coherence sets in at Tc. We discuss the Nernst effect as an intrinsic characterization of such a phase, in comparison with recent experimental measurements.
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