Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Poster Session: Topological Topics

TT 28.10: Poster

Monday, March 12, 2018, 15:00–19:00, Poster B

Quasiparticle interference pattern in superconducting quantum wells — •Mehdi Biderang¹ and Alireza Akbari^1,2 — ¹Asia Pacific Center for Theoretical Physics, POSTECH, Pohang, Korea — ²Department of Physics, POSTECH, Pohang, Korea

Spin-orbit interaction (SOI) plays an important role in the electronic properties of solids. Particularly, when it is originating from the bulk inversion symmetry breaking combining to the asymmetry of confining potential, it moves to Dresselhaus or Rashba types of SOIs. In superconducting state, these types of SOIs may cause the parity mixing and occurrence of the accidental node in the superconducting gap. We study the symmetry of superconducting gap and its trace on the quasiparticle interference pattern for a two-dimensional superconducting quantum well grown in (110) direction, by considering the effect of the interplay of Rashba and Dresselhaus SOIs. Our theoretical results show that changing the relative strength of Dresselhaus to Rashba, from 0 to 1, leads to fix the spin quantization axis at fully mixed Dresselhaus-Rashba. Moreover, a C4 symmetry of superconducting pairing changes to C2, which is consistent with the variation of the Fermi surface topology.