Bulk transport through superconducting hybrid structures in HgTe quantum wells

E. G. Novik; M. Guigou; P. Recher

doi:10.1103/PhysRevB.90.165442

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Bulk transport through superconducting hybrid structures in HgTe quantum wells

E. G. Novik, M. Guigou, P. Recher

DOI 10.1103/PhysRevB.90.165442 · Physical Review B

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Abstract

We investigate the subgap bulk transport through short and wide superconducting hybrid structures based on HgTe quantum wells (QWs). We show that the differential conductance of a normal-metal–insulator–superconductor (NIS) proximity structure behaves in a qualitatively different way with respect to the topological phase of the HgTe QW. We compare the differential conductance for the NIS structure within the wave-matching method based on the Bogoliubov–de Gennes equation and the matrix method based on the normal-state scattering matrix and find that the two models agree for highly doped N and S contacts. We also show that the effect of a possible Rashba spin-orbit interaction on the differential conductance can be significant for weakly doped N and S contacts. Our findings should be important in samples with a large aspect ratio where bulk contributions in transport are dominant.