Dynamical spin susceptibility in the δ-density wave state:
A comparison of theory and experiment

Ilya Eremin

Freie Universität Berlin, Institut für Theoretische Physik, Arnimallee 14, 14195 Berlin, Germany

J.-P. Ismer and I. Eremin Inelastic neutron scattering (INS) experiments probing dynamical spin susceptibility in the pseudogap phase of the high-Tc cuprates are addressed in the framework of the ordered d-density wave(DDW) state. In particular, we analyze the formation of the resonance peak at the antiferromagnetic wave vector and its dispersion in three different ordered states: d-wave superconductor (DSC), DDW state, and coexisting DDW and DSC states. Furthermore, we investigate the structure of the particle-hole continuum, the formation of 'silent' bands, and most interestingly, the behavior of the upward part of the resonance peak dispersion. The new features arising due to DDW ordering are discussed.