2003/04/08 by Degang Zhang, C. S. Ting
Engineering · Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.012501
3 pages, 3 figures
arxiv created 2003/04/08 · openalex publication_date 2004/01/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Motivated by the recent scanning tunneling microscopy (STM) experiments [J. E. Hoffman et al., Science 297, 1148 (2002); K. McElroy et al., Nature (London) 422, 592 (2003)], we investigate the real-space local density of states (LDOS) induced by weak disorder in a d-wave superconductor. We first present the energy- dependent LDOS images around a single weak defect at several energies, and then point out that the experimentally observed checkerboard patterns in the LDOS could be understood as a result of quasiparticle interference by randomly distributed defects. It is also shown that the checkerboard pattern oriented along 45\ifmmode^∘\else\textdegree\fi to the Cu-O bonds at low energies would transform to that oriented parallel to the Cu-O bonds at higher energies. This result is consistent with the experiments.