Impurity and interface bound states in dx2–y2 + idxy and px + ipy superconductors

• Published in: Physical Review B
• Main Authors: Wang, ZD, Wang, QH
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Physical Society. The Journal's web site is located at http://prb.aps.org/ 2004
• Subjects: Physics; IPY
• Online Access: https://doi.org/10.1103/PhysRevB.69.092502; http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=69&issue=9&spage=092502:1&epage=4&date=2004&atitle=Impurity+and+interface+bound+states+in+dx2–y2+++idxy+and+px+++ipy+superconductors; http://hdl.handle.net/10722/43411

Motivated by recent discoveries of novel superconductors such as NaxCoO2·yH2O and Sr2RuO4, we analyze features of quasiparticle scattering due to impurities and interfaces for possible gapful dx2–y2 + idxy and px + ipy Cooper pairing. A bound state appears near a local impurity, and a band of bound states form near an interface. We obtained analytically the bound-state energy, and calculated the space and energy dependent local density of states resolvable by high-resolution scanning tunnelling microscopy. For comparison we also sketch results of impurity and interface states if the pairing is nodal p or d wave. published_or_final_version