Tunable Klein-like tunneling of high-temperature superconducting pairs into graphene
arXiv:1905.12904 · doi:10.1038/nphys4278
Abstract
Superconductivity can be induced in a normal material via the leakage of superconducting pairs of charge carriers from an adjacent superconductor. This so-called proximity effect is markedly influenced by graphene unique electronic structure, both in fundamental and technologically relevant ways. These include an unconventional form of the leakage mechanism the Andreev reflection and the potential of supercurrent modulation through electrical gating. Despite the interest of high-temperature superconductors in that context, realizations have been exclusively based on low-temperature ones. Here we demonstrate gate-tunable, high-temperature superconducting proximity effect in graphene. Notably, gating effects result from the perfect transmission of superconducting pairs across an energy barrier -a form of Klein tunneling, up to now observed only for non-superconducting carriers- and quantum interferences controlled by graphene doping. Interestingly, we find that this type of interferences become dominant without the need of ultra-clean graphene, in stark contrast to the case of low-temperature superconductors. These results pave the way to a new class of tunable, high-temperature Josephson devices based on large-scale graphene.
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- Long-Range Propagation and Interference of -wave Superconducting Pairs in Graphene
- Mapping multi-valley Lifshitz transitions induced by field-effect doping in strained MoS2 nanolayers
- Andreev Reflection and Klein Tunneling in High-Temperature Superconductor/Graphene Junctions
- Superconducting proximity effect in -wave cuprate/ graphene heterostructures
- Effects of discrete topology on quantum transport across a graphene junction: A quantum gravity analogue
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- Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
- Coupling of Klein-Andreev Resonant States in BiSrCaCuO-graphene-BiSrCaCuO Devices