Double-gap superconducting proximity effect in nanotubes

Abstract

We theoretically explore the possibility of a superconducting proximity effect in single-walled metallic carbon nanotubes due to the presence of a superconducting substrate. An unconventional double-gap situation can arise in the two bands for nanotubes of large radius wherein the tunneling is (almost) symmetric in the two sublattices. In such a case, a proximity effect can take place in the symmetric band below a critical experimentally-accessible Coulomb interaction strength in the nanotube. Furthermore, due to interactions in the nanotube, the appearance of a BCS gap in this band stabilizes superconductivity in the other band at lower temperatures. We also discuss the scenario of highly asymmetric tunneling and show that this case too supports double-gap superconductivity.

4 pages, 2 figures

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• Topological proximity effects in a Haldane-graphene bilayer system
• Topology and zero energy edge states in carbon nanotubes with superconducting pairing
• Transport signatures of topological phases in double nanowires probed by spin-polarized STM
• Time-Reversal Soliton Pairs In Even Spin-Chern-Number Higher-Order Topological Insulators
• Kondo induced π-phase shift of microwave photons in a circuit quantum electrodynamics architecture
• Disorder-induced superconductivity in ropes of carbon nanotubes
• Spin-orbit coupling and proximity effects in metallic carbon nanotubes