Impurity Effect Of D-wave High-Tc Superconductors In The Presence Of The Charge Modulation

Superconductor theory is involved with an extremely wide area. Not only does it lay the theoretical foundation of high-Tc superconductor, but also supports the current frontier science research and technology innovation. Based on the BCS theory and starting from the Bogoliubov-de-Gennes(Bd G) equation, we discuss the numerical results of the charge-density-wave(CDW) and impurity effect in high-Tc superconductors.The main contents and conclusions are as follows:Based on a phenomenological model, we study theoretically the impurity effect in d-wave high-Tc superconductors in the presence of the charge-density-wave(CDW) order. Our results verify that the intensity of the resonance state induced by the impurity depends on the CDW scattering strength. It first increase and then decreases as the CDW scattering strength increases. Moreover, the impurity state exists only near the impurity site without the CDW modulation, while it would appear at quite far away from the impurity site in presence of the CDW modulation. The above results may be tested by later scanning tunneling microscopy experiments.