Pair Phase Fluctuations and the Pseudogap

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The single-particle density of states and the tunneling conductance are studied for a two-dimensional BCS-like Hamiltonian with a dₓ₂₋y₂-gap and phase fluctuations. The latter are treated by a classical Monte Carlo simulation of an XY model. Comparison of our results with recent scanning tunneling spectra of Bi-based high-Tc cuprates supports the idea that the pseudogap behavior observed in these experiments can be understood as arising from phase fluctuations of a dₓ₂₋y₂ pairing gap whose amplitude forms on an energy scale set by TcMF well above the actual superconducting transition.