Quasiparticle scattering image in hidden order phases and chiral superconductors

• The chiral multigap structure of Sr2RuO4 leads to rotation of QPI spectrum with bias voltage.
• 5f band reconstruction in hidden order phase of URu2Si2 is obtained from two orbital model.
• The chiral superconductivity in URu2Si2 leads to quasi-2D quasiparticle interference (QPI).

The technique of Bogoliubov quasiparticle interference (QPI) has been successfully used to investigate the symmetry of unconventional superconducting gaps, also in heavy fermion compounds. It was demonstrated that QPI can distinguish between the d-wave singlet candidates in CeCoIn5. In URu2Si2 presumably a chiral d-wave singlet superconducting (SC) state exists inside a multipolar hidden order (HO) phase. We show that hidden order leaves an imprint on the symmetry of QPI pattern that may be used to determine the essential question whether HO in URu2Si2 breaks the in-plane rotational symmetry or not. We also demonstrate that the chiral d-wave SC gap leads to a crossover to a quasi-2D QPI spectrum below Tc which sharpens the HO features. Furthermore we investigate the QPI image of chiral p-wave multigap superconductor Sr2RuO4.