SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.11: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2
Towards topological superconductivity on the surface of LiFeAs — •Luise Merkwitz1, Andrii Kuibarov1, Rui Lou1,2, Alexander Fedorov1,2, Sabine Wurmehl1, Saicharan Aswartham1, Igor Morozov1, Bernd Büchner1, and Sergey Borisenko1 — 1Leibniz-Institute for Solid State Research, IFW-Dresden, D-01171 Dresden, Germany — 2Helmholtz-Zentrum Berlin, BESSY, D-12489 Berlin, Germany
Realisation of topological superconductivity is theoretically possible in iron-based superconductors, where the s-wave pairing in the bulk can induce superconductivity of the topological surface states. The detection of the latter by angle-resolved photoemission spectroscopy (ARPES) in LiFeAs and FeSeTe systems is questionable since the bulk-originated dispersions can mimic the Dirac crossing and inverted gap is expected to be very small (of the order of 5 meV). The only feasible possibility to detect topological surface states in such a small gap is to bring it to the Fermi level where the scattering is minimal. We have synthesized differently doped LiFe1−xYxAs (Y=Co, V) crystals and performed synchrotron-based ARPES studies to map kz-dispersion in detail. Our results demonstrate the principal possibility of tuning the binding energy of the inverted gap in these systems and point to the optimal composition where this binding energy is close to zero. In addition, our results reveal considerable renormalization anisotropy of the Fe d-states never detected earlier.