2007/04/19 by A. Ossipov, Alexander Ossipov, M. Titov +1
Engineering · Materials Science · Physics and Astronomy · #Graphene research and applications #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.75.241401
published as Phys. Rev. B 75, 241401(R) (2007) · 4 pages, 3 figures
arxiv created 2007/04/19 · openalex publication_date 2007/06/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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\text\ensuremath-p\text\ensuremath-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.