Crossed Andreev reflection in zigzag phosphorene nanoribbon based ferromagnet/superconductor/ferromagnet junctions

Abstract

We study the crossed Andreev reflection in zigzag phosphorene nanoribbon based ferromagnet/superconductor/ferromagnet junction. Only edge states, which are entirely detached from the bulk gap, involved in the transport processes. The perfect crossed Andreev reflection, with the maximal nonlocal conductance $$-2e^{2}/h$$ - 2 e 2 / h , is addressed by setting the electric potentials of the leads and device properly. At this situation, the local Andreev reflection and the electron tunneling are completely eliminated, the incoming electrons can only be reflected as electrons or transmitted as holes, corresponding to the electron reflection and the crossed Andreev reflection respectively.The nonlocal conductance oscillates periodically with the length and the electric potential of the superconductor. Our study shows that the phosphorene based junction can be used as the quantum device to generate entangled-electrons.

Ultra‐Narrow Phosphorene Nanoribbons Produced by Facile Electrochemical Process

“…In addition to topologically‐protected edge states, [ 19 ] some of the other exotic properties predicted for these structures include spin‐density waves, [ 20 ] strain‐dependent antiferromagnetism, [ 21 ] and half‐metallic behavior [ 22 ] which could be relevant to spintronics applications, [ 23 ] the spin‐dependent Seebeck effect, [ 24 ] that could help to advance thermoelectric technologies, and a large singlet–triplet splitting, [ 18 ] that could potentially be relevant to quantum information. The crossed Andreev reflection [ 25 ] has also been recently investigated theoretically in structures based on such nanoribbons.…”