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 + i p 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., m a g n e t o t u n n e l i n g , is a promising method of determining the pairing symmetry of unconventional superconductors.