Chiral p+ip triplet states existing in the graphene sandwiched by even-parity superconductor and ferromagnet*

We proposed a sandwiched structure odd-parity superconductor/graphene/ferromagnet and theoretically investigated the triplet superconductivity in the hole-doped graphene. In our theory the superconducting and Kondo interactions are arose from spin fluctuations and ferromagent, respectively, and both interactions fall in a competition. Our calculations have confirmed that the triplet superconductivity is p+ip chiral state as shown in fig. 1. Our theory predicts that the critical supercurrent of the sandwiched sample varying with the magnetic field would increase to saturation in the beginning then gradually decrease to the end. The sandwiched structure is composed a buffer layer of graphene which provide an accommodation for triplet superconducting pairs to maintain. We believed that the sandwiched sample is better than the heterostructure, i.e., even-parity superconductor/ferromagnet, which could increase the possibility for detecting the triplet superconductivity.