%0 Journal Article %1 PhysRevLett.130.256001 %A Ding, Peize %A Schwemmer, Tilman %A Lee, Ching Hua %A Wu, Xianxin %A Thomale, Ronny %D 2023 %I American Physical Society %J Phys. Rev. Lett. %K a %N 25 %P 256001 %R 10.1103/PhysRevLett.130.256001 %T Hyperbolic fringe signal for twin impurity quasiparticle interference %U https://link.aps.org/doi/10.1103/PhysRevLett.130.256001 %V 130 %X We study the quasiparticle interference (QPI) pattern emanating from a pair of adjacent impurities on the surface of a gapped superconductor (SC). We find that hyperbolic fringes (HFs) in the QPI signal can appear due to the loop contribution of the two-impurity scattering, where the locations of the two impurities are the hyperbolic focus points. For a single pocket Fermiology, a HF pattern signals chiral SC order for nonmagnetic impurities and requires magnetic impurities for a nonchiral SC. For a multipocket scenario, a sign-changing order parameter such as an s± wave likewise yields a HF signature. We discuss twin impurity QPI as a new tool to complement the analysis of superconducting order from local spectroscopy.

@article{PhysRevLett.130.256001, abstract = {We study the quasiparticle interference (QPI) pattern emanating from a pair of adjacent impurities on the surface of a gapped superconductor (SC). We find that hyperbolic fringes (HFs) in the QPI signal can appear due to the loop contribution of the two-impurity scattering, where the locations of the two impurities are the hyperbolic focus points. For a single pocket Fermiology, a HF pattern signals chiral SC order for nonmagnetic impurities and requires magnetic impurities for a nonchiral SC. For a multipocket scenario, a sign-changing order parameter such as an s± wave likewise yields a HF signature. We discuss twin impurity QPI as a new tool to complement the analysis of superconducting order from local spectroscopy.}, added-at = {2023-07-03T12:12:07.000+0200}, author = {Ding, Peize and Schwemmer, Tilman and Lee, Ching Hua and Wu, Xianxin and Thomale, Ronny}, biburl = {https://www.bibsonomy.org/bibtex/2f1797b85efe96fde41f6b3605a96a4af/ctqmat}, day = 17, description = {Hyperbolic Fringe Signal for Twin Impurity Quasiparticle Interference}, doi = {10.1103/PhysRevLett.130.256001}, interhash = {dd1f90eb2303092544d409abdfc82c7b}, intrahash = {f1797b85efe96fde41f6b3605a96a4af}, journal = {Phys. Rev. Lett.}, keywords = {a}, month = {05}, number = 25, numpages = {6}, pages = 256001, publisher = {American Physical Society}, timestamp = {2023-10-13T11:18:05.000+0200}, title = {Hyperbolic fringe signal for twin impurity quasiparticle interference}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.130.256001}, volume = 130, year = 2023 }