Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
Quasiparticle interference (QPI) by means of scanning tunneling microscopy/spectroscopy (STM/STS), angle resolved photoemission spectroscopy (ARPES), and multi-orbital tight bind- ing calculations are used to investigate the band structure and superconducting order parameter of LiFeAs. Using this combination we identify intra- and interband scattering vectors between the hole (h) and electron …