Theory of tunnelling conductance of d+ip-wave superconductor

The physics of zero energy Andreev bound states (ZESABS) in high Tc cuprate has been studied up to now [1-2]. One of the interesting issue is the instability of ZESABS against time reversal symmetry breaking [3]. Recently, d+ip pairing state has been proposed at the (110) surface [4]. We theoretically study the tunneling conductance of the d+ip-wave superconductor based on the quasiclassical Eilenberger theory. We demonstrate that the zero-bias conductance peak is robust against the spin-triplet p-wave surfacesubdominant order, whereas it is fragile against the spin-singlet s-wave one. Comparing our numerical results and the experimental results, we conclude the surface induced spin-triplet p-wave surface subdominant order is feasible.
[1]C. R. Hu, Phys. Rev. Lett. 72, 1526 (1994)
[2]Y. Tanaka and S. Kashiwaya, Phys. Rev. Lett. 74 3451 (1995)
[3]M. Matsumoto and H. Shiba, J. Phys. Soc. Jpn 64, 1703 (1995)
[4] S. Matsubara and H. Kontani, Phys. Rev. B 101, 235103 (2020).