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<p>We investigated the zero-bias conductance peak in a graphene-based ferromagnet/ferromagnet/barrier/<i>d</i>-wave superconductor (F/F/B/<i>d</i>-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/<i>d</i>-wave SC heterojunctions and hold promise for the development of graphene-based superconducting spintronic devices.</p>

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Zero bias conductance peak related to spin triplet states in noncollinear magnetized graphene superconducting junctions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月21日

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  • Chuan Tan,
  • Qingping Wu,
  • Haoran Li,
  • Zhengfang Liu,
  • Xianbo Xiao

摘要

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.