Pairing in doped spin liquids: Anyon versusd-wave superconductivity

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Abstract
Using a simple variational ansatz, we estimate the pair wave function of a superconductor obtained by doping a Mott insulator with short-range antiferromagnetic spin correlations. The pairing symmetry is generically d wave. The so-called ‘‘anyon superconductors’’ are related to traditional BCS states with d-wave order parameters that break parity and time-reversal invariance. The transition between a tetragonal normal metal and a superconductor of this type generically proceeds through an intermediate phase with either superconducting order or broken time reversal, but not both.