Andreev reflection at the edge of a two-dimentional semimetal

Abstract

We investigate electron transport through the interface between a niobium superconductor and the edge of a two-dimensional semimetal, realized in a 20~nm wide HgTe quantum well. Experimentally, we observe that typical behavior of a single Andreev contact is complicated by both a pronounced zero-bias resistance anomaly and shallow subgap resistance oscillations with $1/n$ periodicity. These results are demonstrated to be independent of the superconducting material and should be regarded as specific to a 2D semimetal in a proximity with a superconductor. We interpret these effects to originate from the Andreev-like correlated process at the edge of a two-dimensional semimetal.

5 pages

References in corpus (5)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• The electronic properties of bilayer graphene
• Superconductivity of doped Weyl semimetals: finite-momentum pairing and electronic analogues of the 3He-A phase
• Transport in two-dimensional disordered semimetals
• Nonlocal Andreev reflection, fractional charge and current-phase relation in topological bilayer exciton condensate junctions

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• Thermopower of a Two-Dimensional Semimetal in a HgTe Quantum Well
• Transport properties of an electron-hole bilayer/superconductor hybrid junction
• Quantum Transport Properties of an Exciton Insulator/Superconductor Hybrid Junction
• Scattering anisotropy in HgTe (013) quantum well
• Cooper pair splitting in ballistic ferromagnetic SQUIDs
• Specular Andreev reflection at the edge of an InAs/GaSb double quantum well with band inversion
• Interlayer current near the edge of an InAs/GaSb double quantum well in proximity with a superconductor