456 research outputs found

    Theory of magnetotunneling spectroscopy in spin triplet p-wave superconductors

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    We study the influence of a magnetic field HH 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 HH 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 pxp_{x}+ipyp_{y}-wave superconductor junctions, the height of ZBCP is sensitive to HH due to the formation of broken time reversal symmetry state. We propose that tunneling spectroscopy in the presence of magnetic field, i.e.i.e., magnetotunnelingmagnetotunneling, 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

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    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 Sr2_{2}RuO4_{4}. 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 Cux_xBi2_2Se3_3

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    We propose three possible momentum-dependent pairing potentials for candidate of topological superconductor (for example Cux_xBi2_2Se3_3), 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 C3C_3 rotation symmetry. We hope our proposals and results be judged by future experiment.Comment: 5 pages, 3 figure
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