Mechanism of Pseudogap Probed by a Local Impurity
Mechanism of Pseudogap Probed by a Local Impurity
The response to a local strong nonmagnetic impurity in the pseudogap phase is examined in two distinctly different scenarios: phase fluctuation (PF) of pairing field and d-density-wave (DDW) order. In the PF scenario, the resonance state is generally double peaked near the Fermi level, and is abruptly broadened by vortex …