Print Email Facebook Twitter Conductance asymmetries in mesoscopic superconducting devices due to finite bias Title Conductance asymmetries in mesoscopic superconducting devices due to finite bias Author De Almeida Nascimento e Melo, A.A. (TU Delft QN/Akhmerov Group; Kavli institute of nanoscience Delft) Liu, C. (TU Delft QRD/Wimmer Group; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Rozek, P.M. (TU Delft QRD/Wimmer Group; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Rosdahl, T.O. (TU Delft QRD/Wimmer Group; Kavli institute of nanoscience Delft) Wimmer, M.T. (TU Delft QRD/Wimmer Group; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Date 2021 Abstract Tunneling conductance spectroscopy in normal metal-superconductor junctions is an important tool for probing Andreev bound states in mesoscopic superconducting devices, such as Majorana nanowires. In an ideal superconducting device, the subgap conductance obeys specific symmetry relations, due to particle-hole symmetry and unitarity of the scattering matrix. However, experimental data often exhibits deviations from these symmetries or even their explicit breakdown. In this work, we identify a mechanism that leads to conductance asymmetries without quasiparticle poisoning. In particular, we investigate the effects of finite bias and include the voltage dependence in the tunnel barrier transparency, finding significant conductance asymmetries for realistic device parameters. It is important to identify the physical origin of conductance asymmetries: in contrast to other possible mechanisms such as quasiparticle poisoning, finite-bias effects are not detrimental to the performance of a topological qubit. To that end we identify features that can be used to experimentally determine whether finite-bias effects are the source of conductance asymmetries. To reference this document use: http://resolver.tudelft.nl/uuid:f97bf288-40f9-475c-98cd-98f68e9b4aad DOI https://doi.org/10.21468/SCIPOSTPHYS.10.2.037 ISSN 2542-4653 Source SciPost Physics, 10 (2) Part of collection Institutional Repository Document type journal article Rights © 2021 A.A. De Almeida Nascimento e Melo, C. Liu, P.M. Rozek, T.O. Rosdahl, M.T. Wimmer Files PDF SciPostPhys_10_2_037.pdf 2.03 MB Close viewer /islandora/object/uuid:f97bf288-40f9-475c-98cd-98f68e9b4aad/datastream/OBJ/view