Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors

Details Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors

2002-05-12

arxiv.org/abs/cond-mat/0205246v1

Physics

Condensed Matter

Superconductivity

4 pages, 6 figures, using jpsj2.cls

Scientific paper

10.1143/JPSJ.71.2102

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 $p_{x}$+i$p_{y}$-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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