REFLECTIONS ON THE ONE-DIMENSIONAL REALIZATION OF ODD-FREQUENCY PAIRING

We discuss the odd-frequency pairing correlations discovered by Zachar , Kivelson and Emery (ZKE) in a one-dimensional Kondo lattice. A speci fic lattice model that realizes the continuum theory of ZKE is introdu ced and the correlations it gives rise to are identified as odd-freque ncy singlet pairing. The excitation spectrum is found to contain a spi n gap, and a much lower energy band of spinless excitations. We discus s how the power-law correlations realized in the ZKE model evolve into true long-range order when Kondo chains are weakly coupled together a nd tentatively suggest a way in which the higher-dimensional model can be treated using mean-held theory.