Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Properties and Electronic Structure 1

TT 2.3: Talk

Monday, March 20, 2017, 10:00–10:15, HSZ 103

Surface state tunneling signatures in two-component superconductor UPt₃ — •Fabian Lambert¹, Alireza Akbari^2,3, Peter Thalmeier⁴, and Ilya Eremin¹ — ¹Institut 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 E_1g,u or E_2u, 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 E_2u 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.