SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Topological Superconductors
TT 29.3: Talk
Friday, October 1, 2021, 14:00–14:15, H7
Sub-gap and supra-gap transport characteristics of the finite Kitaev chain — •Nico Leumer1, Milena Grifoni1, Bhaskaran Muralidharan2, and Magdalena Marganska1 — 1Institute for Theoretical Physics, University of Regensburg, Germany — 2Department of Electrical Engineering, Indian Institute of Technology Bombay, India
We investigate the nonlinear transport in a normal - Kitaev chain- normal (N-K-N) junction. Using exact analytical results for the spectrum and Green’s function of the Kitaev chain in the whole regime of parameters, an exact expression for the linear conductance is provided, and insight into the complex interplay of crossings and anticrossings in the supra-gap region is obtained. In particular, we discuss how the ratio of the direct charge transfer and the local Andreev reflection relates to the spatial profile of the lowest lying state. Also, we demonstrate that the supra-gap transport shows stable and strong contributions from the local Andreev reflection which yields the same contribution as the direct processes at the anti-crossing [1].
[1] N. Leumer, M. Grifoni, B. Muralidharan, M. Marganska, Phys. Rev. B, 103, 165432 (2021)