Valley-Related Anomalous Andreev Reflection in Ferromagnet-Strain/Kekulé-Y/Superconductor Graphene Junctions

The paper provides a theoretical analysis of the scattering process within a ferromagnet-strain/Kekulé-Y/superconductor graphene heterostructure. Equal-valley pair correlations in the vicinity of the ferromagnet-Kekulé-Y interface have been calculated, revealing a direct relationship between valley-related anomalous Andreev reflection, which is caused by the proximity effect in the presence of Kekulé-Y‑shaped graphene. The results show that the action of magnetic vector, strain and Kekulé-Y graphene caenhance the anomalous Andreev reflection. Moreover, by calculating the charge conductance and valley polarization conductance, our results reveal that the valley polarization conductance can be enhanced by Kekulé-Y shaped, strain and magnetic vector. These findings may provide a tool for detecting the entanglement of the equal valley superconducting pair correlations in hybrid structures.