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We experimentally investigate electron transport through the interfacebetween a superconductor and the edge of a two-dimensional electron system withband inversion. The interface is realized as a tunnel NbN side contact to anarrow 8~nm HgTe quantum well. It demonstrates a typical Andreev behavior withfinite conductance within the superconducting gap. Surprisingly, theconductance is modulated by a number of equally-spaced oscillations. Theoscillations are present only within the superconducting gap and at lowest,below 1~K, temperatures. The oscillations disappear completely in magneticfields, normal to the two-dimensional electron system plane. In contrast, theoscillations' period is only weakly affected by the highest, up to 14~T,in-plane oriented magnetic fields. We interpret this behavior as theinterference oscillations in a helical one-dimensional edge channel due to aproximity with a superconductor.

Conductance oscillations at the interface between a superconductor and the helical edge channel in a narrow HgTe quantum well