Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors

We study the influence of a magnetic field H on the zero bias conductance peak (ZBCP) due to zero energy Andreev bound states (ZES) in a normal metal/unconventional superconductor. For p-wave junctions, ZBCP does not split into two by H even for sufficiently low transparent junctions, where ZBCP clearly splits for d-wave. This unique property originates from the fact that for p-wave superconductors, perpendicularly injected quasiparticles form ZES, which contribute most dominantly to the tunneling conductance. In addition, we show that for p(x) + ip(y)-wave superconductor junctions, the height of ZBCP is sensitive to H due to the formation of a broken time reversal symmetry state. We propose that tunneling spectroscopy in the presence of a magnetic field, i.e., magnetotunneling, is a promising method of determining the pairing symmetry of unconventional superconductors.