Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.10: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
QPI in singlet, triplet and non-centrosymmetric unconventional superconductors — •Alireza Akbari1 and Peter Thalmeier2 — 1MPI for Solid State Research, Stuttgart, Germany — 2MPI for the Chemical Physics of Solids, Dresden, Germany
The technique of quasiparticle interference (QPI) has recently been successfully applied to heavy fermion compounds to determine the unconventional superconducting gap symmetry. It was proposed [1] and proven [2,3] that QPI can distinguish between the d-wave singlet candidates of superconducting CeCoIn5.
The QPI theory has now also been developed for non-centrosymmetric (NCS) superconductors [4] with mixed singlet-triplet gap function. Qualitatively new effects in the QPI pattern originate from Rashba spin-orbit coupling: Distinct differences between charge- and spin QPI and anisotropies appear due to additional Rashba coherence factors. We use Born approximation and full t-matrix theory to calculate the QPI spectrum and apply it to a 2D model for the NCS heavy fermion unconventional superconductor CePt3Si. We discuss the new QPI features for a gap model with accidental node lines due to its composite singlet-triplet nature.
Furthermore we predict the quasiparticle interference spectrum for the multiband chiral p-wave superconductor Sr2RuO4 [5] and the possible chiral d-wave superconductor SrPtAs.
A. Akbari et al, PRB 84 , 134505 (2011)
M. P. Allan et al, Nat. Phys. 9, 468 (2013)
B. B. Zhou et al, Nat. Phys. 9, 474 (2013)
A. Akbari and P. Thalmeier, EPL, 102, 57008 (2013)
A. Akbari and P. Thalmeier, PRB 88, 134519 (2013)