456 research outputs found
Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors
We study the influence of a magnetic field 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 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 +i-wave superconductor junctions, the height of ZBCP is
sensitive to due to the formation of broken time reversal symmetry state.
We propose that tunneling spectroscopy in the presence of magnetic field,
, , is an promising method to determine the pairing
symmetry of unconventional superconductors.Comment: 4 pages, 6 figures, using jpsj2.cl
Theory of tunneling spectroscopy in superconducting Sr2RuO4
A theory for tunneling spectroscopy in normal metal /insulator/triplet
superconductor junction is presented. We assume two kinds of non-unitary
triplet superconducting states which are the most promising states for
SrRuO. The calculated conductance spectra showzero-bias peaks as
well as gap structures. The existences of residual components in the spectra
reflect the non-unitary properties of superconducting states.Comment: 5pages, 4figures(included), to be published in Phys.Rev.B 56, (1997
Surface Spectral Function of Momentum-dependent Pairing Potentials in a Topological Insulator: Application to CuBiSe
We propose three possible momentum-dependent pairing potentials for candidate
of topological superconductor (for example CuBiSe), and calculate
the surface spectral function and surface density of state with these pairing
potentials. We find that the first two can give the same spectral functions as
the fully-gapped and node-contacted pairing potentials given in [Phys. Rev.
Lett. 105, 097001], and that the third one can obtain topological non-trivial
case which exists flat Andreev bound state and preserves the rotation
symmetry. We hope our proposals and results be judged by future experiment.Comment: 5 pages, 3 figure
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