Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors
Abstract
We study the influence of a magnetic field H on the zero-bias conductance peak (ZBCP) due to zero-energy Andreev bound state (ZES) in 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 quasiparticle form ZES, which contribute most dominantly on the tunneling conductance. In addition, we show that for px+ipy-wave superconductor junctions, the height of ZBCP is sensitive to H due to the formation of broken time reversal symmetry state. We propose that tunneling spectroscopy in the presence of magnetic field, i.e., magnetotunneling, is an promising method to determine the pairing symmetry of unconventional superconductors.
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