A generalized method of image is developed to investigate the tunneling spectrum from the metal into a class of states, with the tight-binding dispersion fully included. The broken reflection symmetry is shown to be the necessary condition for the appearance of the zero-bias conductance peak (ZBCP). Applying this method to the d-wave superconductor yields results in agreement with experiments regarding the splitting of ZBCPs in magnetic field. Furthermore, a ZBCP is predicted for tunneling into the (110) direction of the d-density wave state, providing a signature to look for in experiments.
@article{arxiv.cond-mat/0112262,
title = {Generalized method of image and the tunneling spectroscopy in high-Tc superconductors},
author = {Shin-Tza Wu and Chung-Yu Mou},
journal= {arXiv preprint arXiv:cond-mat/0112262},
year = {2016}
}