Subharmonic gap structure in d-wave superconductors
نویسندگان
چکیده
We present a self-consistent theory of current-voltage characteristics of d-wave/d-wave contacts at arbitrary transparency. In particular, we address the open problem of the observation of subharmonic gap structure ~SGS! in cuprate junctions. Our analysis shows that ~i! the SGS is possible in d-wave superconductors; ~ii! the existence of bound states within the gap results in an even-odd effect in the SGS; ~iii! elastic scattering mechanisms, like impurities or surface roughness, may suppress the SGS; and ~iv! in the presence of a magnetic field the Doppler shift of the Andreev bound states leads to a splitting of the SGS, which is an unambiguous fingerprint of d-wave superconductivity.
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