Reentrance effect in a graphene n-p-n junction coupled to a superconductor

Abstract

We study the interplay of Klein tunneling (= interband tunneling) between n-doped and p-doped regions in graphene and Andreev reflection (= electron-hole conversion) at a superconducting electrode. The tunneling conductance of an n-p-n junction initially increases upon lowering the temperature, while the coherence time of the electron-hole pairs is still less than their lifetime, but then drops back again when the coherence time exceeds the lifetime. This reentrance effect, known from diffusive conductors and ballistic quantum dots, provides a method to detect phase coherent Klein tunneling of electron-hole pairs.

4 pages, 3 figures

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• Weak localisation magnetoresistance and valley symmetry in graphene
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Cited by in corpus (16)

• The electronic properties of graphene
• Andreev reflection and Klein tunneling in graphene
• Nonlinear screening and ballistic transport in a graphene p-n junction
• Transport Through Andreev Bound States in a Graphene Quantum Dot
• Effect of disorder on a graphene p-n junction
• Andreev reflection in graphene nanoribbons
• Microscopic theory of the proximity effect in superconductor-graphene nanostructures
• Nanometer-scale lateral p-n junctions in graphene/$\alpha$-RuCl${}_3$ heterostructures
• Dirac Green's function approach to graphene-superconductor junctions with well defined edges
• Selective focusing of electrons and holes in a graphene-based superconducting lens
• Tunable Supercurrent at the Charge Neutrality Point via Strained Graphene Junctions
• Effect of Coulomb carrier drag and terahertz plasma instability in p+-p-i-n-n+ graphene tunneling transistor structures
• Resonant plasmonic terahertz detection in gated graphene p-i-n field-effect structures enabled by the Zener-Klein tunneling nonlinearity
• Graphene Andreev Billiards
• Transit-time resonances enabling amplification and generation of terahertz radiation in periodic graphene p-i-n structures with the Zener-Klein interband tunneling
• Proximity-induced superconductivity in Landau-quantized graphene monolayers