Andreev reflection spectroscopy in strongly paired superconductors

One of the challenges in pursuit solid state BEC superconductors is need for unambiguous experimental signatures. Here, authors propose a new signature, relying on Andreev reflection, which distinguishes from BCS superconductors. They demonstrate that, standard tunneling spectroscopy setup, superconductor exhibits suppressed reflection; however, if barrier becomes potential well, then appreciable reflection can be revived. Their predictions probed various architectures that are also discussed.