Chiral adiabatic transmission protected by Fermi surface topology
Isidora Araya Day (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group)
K. Vilkelis (TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
A.L. Rigotti Manesco (TU Delft - QN/Akhmerov Group, Kavli institute of nanoscience Delft)
A. Mert Bozkurt (Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group, TU Delft - QuTech Advanced Research Centre)
V. Fatemi (Cornell University)
AR Akhmerov (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We demonstrate that Andreev modes that propagate along a transparent Josephson junction have a perfect transmission at the point where three junctions meet. The chirality and the number of quantized transmission channels is determined by the topology of the Fermi surface and the vorticity of the superconducting phase differences at the trijunction. We explain this chiral adiabatic transmission (CAT) as a consequence of the adiabatic evolution of the scattering modes both in momentum and real space. The dispersion relation of the junction then separates the scattering trajectories by introducing inaccesible regions of phase space. We expect that CAT is observable in nonlocal conductance and thermal transport measurements. Furthermore, because it does not rely on particle-hole symmetry, CAT is also possible to observe directly in metamaterials.
help_outline