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Published on: August 2, 2019
Zero bias conductance peak related to spin triplet states in noncollinear magnetized graphene superconducting
Chuan Tan1, Qingping Wu2, Haoran Li1
1Department of Applied Physics, East China Jiaotong University, Nanchang, 330013, China.
Abstract:
We investigated the zero-bias conductance peak in a graphene-based ferromagnet/ferromagnet/barrier/d-wave superconductor (F/F/B/d-wave SC) heterojunction. Our research indicates that the spin-triplet pairing states induced by non-collinear magnetizations do not lead to the splitting of the zero-bias conductance peak (ZBCP), and the anomalous Andreev reflection makes a significant contribution to the ZBCP. In the case of half-metal, the triplet bound states appear at zero incident energy due to Klein tunneling, which is coincide with the singlet bound states, resulting in the ZBCP arises solely due to spin-triplet pairing states. The ZBCP can be modulated by the exchange field strength, Fermi level and magnetizations angle. These findings offer deeper understanding of the influence of non-collinear magnetizations on anomalous Andreev reflection in graphene-based F/F/B/d-wave SC heterojunctions and hold promise for the development of graphene-based superconducting spintronic devices.
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