456 research outputs found

### 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 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.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
Sr$_{2}$RuO$_{4}$. 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 Cu$_x$Bi$_2$Se$_3$

We propose three possible momentum-dependent pairing potentials for candidate
of topological superconductor (for example Cu$_x$Bi$_2$Se$_3$), 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 $C_3$ rotation
symmetry. We hope our proposals and results be judged by future experiment.Comment: 5 pages, 3 figure

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