Local density of states around two nonmagnetic impurities in cuprate superconductors

作     者：Zhan-peng HUANG Xia-xia WAN Feng YUAN 

作者机构：College of Physics Science Qingdao University Qingdao 266071 China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2011年第6卷第3期

页      面：309-312页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Acknowledgements The authors would like to thank X. Yah and Dr. B. Liu for helpful discussions. This work was supported by the National Natural Science Foundation of China (Grant No. 10774082) 

主　　题：local density of states (LDOS) nonmagnetic impurities Gutzwiller approximation 

摘      要：The local density of states （LDOS） around two nonmagnetic impurities which are located at different sites is studied within the two-dimensional t-J-U model. The order parameters are determined in a self-consistent way with the Gutzwiller projected mean-field approximation and the Bogoliubov-de Gennes theory. When the two impurities are located one or two sites away, we find the supercon- ductivity coherence peaks are more strongly suppressed and the zero-energy peak （ZEP） has split into two peaks. Whereas when the two impurities are located next to each other, the ZEP vanished, and LDOS does not change a lot compared with the case away from the impurities.