Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.4: Vortrag
Montag, 12. März 2018, 15:45–16:00, H 0110
Mixed-pairing superconductivity in 5d Mott insulators with antisymmetric exchange — Mohammad-Hossein Zare1, Mehdi Biderang2, and •Alireza Akbari2 — 1Department of Physics, Qom University of Technology, Qom, Iran — 2Asia Pacific Center for Theoretical Physics, POSTECH, Pohang, Korea
Currently, remarkable attentions have been attracted to exotic physics driven by the interplay of the spin-orbit coupling and electronic correlations. Particularly, in 5d transition metals, neither the spin-orbit coupling nor the Coulomb interaction can merely lead to the insulating behavior.
We study the symmetry of the potential superconducting order parameter in 5d Mott insulators with an eye to hole doped Sr2IrO4. Using a mean-field method, a mixed singlet-triplet superconductivity, d + p, is observed due to the antisymmetric exchange originating from a quasi-spin-orbit-coupling.
Our calculation of ribbon geometry shows possible existence of the topologically protected edge states, because of nodal structure of the superconducting gap.
These edge modes are spin polarized and emerge as zero-energy flat bands, supporting symmetry protected Majorana state, verified by evaluation of winding number and Z2 topological invariant.
At the end, a possible experimental approach for observation of these edge states and determination of the superconducting gap symmetry are discussed based on the quasi-particle interference (QPI) technique.
Phys. Rev. B 96, 205156 (2017)