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Andreev spectroscopy of the triplet superconductivity state in Bi/Ni bilayer system

We calculate the Andreev spectroscopy between a ferromagnetic lead and Bi/Ni bilayer system for three types of superconducting states, including ABM state, ABM state mixing with S-wave state, ABM state mixing with pz-wave state. Among them, ABM state and ABM state mixing with S- wave state can obtain the Andreev conductance consistent with the point contact experiment[G. J. Zhao,et al, arXiv:1810.10403], but failed to explain the experiment of time-domain THz spectroscopy experiment[Prashant Chauhan,et al, Phys. Rev. Lett. 122, 017002(2019)]. Only the ABM state mixing with pz-wave state can explain both experiments. Besides, we reveal the conductance peak near the zero energy is induced by the surface state of the ABM phase. Our work may provides helpful clarification for understanding of recent experiments.

preprint2019arXivOpen access

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