Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Superconductivity: Theory 2

TT 32.2: Vortrag

Mittwoch, 18. März 2020, 09:45–10:00, HSZ 103

Phase sensitive determination of nodal d-wave order parameter in single band superconductors — •Jakob Böker1, Miguel Sulangi2, Peter Hirschfeld2, and Ilya Eremin11Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany — 2Department of Physics, University of Florida, Gainesville, FL 32611

Determining the exact pairing symmetry of a superconducting order parameter remains to be a challenge of great experimental effort. Recently a new method utilizing quasiparticle interference (QPI) measurements based on scanning tunneling spectroscopy was proposed. It states that the momentum-integrated QPI data, antisymmetrized with respect to bias voltage, provides a robust phase sensitive tool to distinguish sign-changing s± from sign-preserving s++ superconductivity in the iron based superconductors. Here we discuss that the same quantity can be used to visualize the sign-changing character of a single band nodal d-wave order parameter, relevant for the cuprate and likely for the infinite-layer nickelate superconductors. Further, using a realistic approach accounting for Cu-Wannier functions, we model STM data of zinc-doped Bi2Sr2CaCu2O8+δ to directly compare our theory with experimental results.

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