2018/05/21 by Xue‐Si Li, Xue-Si Li, Shu-Feng Zhang +3
Materials Science · Physics and Astronomy · #Andreev reflection #Band gap #Condensed matter physics #Conductance #Electron #Graphene #Graphene research and applications #Physics #Quantum and electron transport phenomena #Quantum mechanics #Semimetal #Specular reflection #Superconductivity #Topological Materials and Phenomena #Weyl semimetal #cond-mat.mes-hall
paper · pdf · doi:10.1088/1367-2630/aae280
8 pages, 6 figures
arxiv created 2018/05/21 · openalex created_date 2018/06/01 · openalex publication_date 2018/09/19 · arxiv updated 2018/11/14 · openalex updated_date 2026/08/05
We study the quantum transport behavior of a normal-superconductor-normal junction based on a type-II Weyl semimetal, which is arranged in the tilting direction of the Weyl semimetal. We find that both the crossed Andreev reflection and normal reflection are forbidden, while there will be double Andreev reflections and double electron transmissions for the incident electron from the semimetal side. Andreev reflections and transmissions occur both in the retro and specular directions simultaneously, symmetric about the normal of the interface but with different amplitudes, depending on the angle and energy of incident electrons. These transport processes make the junction here quite different from that based on the normal metal or graphene. In addition, the differential conductance is studied for experimental signatures. We find that the conductance is almost unaffected by the electrostatic potential in the normal region and it is enhanced with increasing junction length.