Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Properties and Electronic Structure 1

TT 2.3: Vortrag

Montag, 20. März 2017, 10:00–10:15, HSZ 103

Surface state tunneling signatures in two-component superconductor UPt3 — •Fabian Lambert1, Alireza Akbari2,3, Peter Thalmeier4, and Ilya Eremin11Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44801 Bochum, Germany — 2Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784, Korea — 3Department of Physics, and Max Planck POSTECH Center for Complex Phase Materials, POSTECH, Pohang 790-784, Korea — 4Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

Quasiparticle interference (QPI) imaging of Bogoliubov excitations in quasi-two dimensional unconventional superconductors has become a powerful technique for measuring the superconducting gap and its symmetry. Here, we present the extension of this method to three-dimensional superconductors and analyze the expected QPI spectrum for the two-component heavy fermion superconductor UPt3 whose gap structure is still controversial. Starting from a 3D electronic structure and the three proposed chiral gap models E1g,u or E2u, we perform a slab calculation that determines the 2D continuum Bogoliubov- de Gennes (BdG) surface bands and in addition the in-gap Andreev bound states that lead to surface Weyl arcs connecting the projected gap nodes. Both features are very distinct for the three models, in particular the most prominent E2u candidate is singled out by the existence of two Weyl arcs due to the double monopole nodes. The signature of these distinct surface bound and continuum states provides a fingerprint that may finally determine the true nodal structure of UPt3.

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