Fractional AC Josephson effect in p-and d-wave superconductors

Kwon, H.-J. ; Sengupta, K. ; Yakovenko, V. M. (2004) Fractional AC Josephson effect in p-and d-wave superconductors The European Physical Journal B - Condensed Matter and Complex Systems, 37 (3). pp. 349-361. ISSN 1434-6028

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For certain orientations of Josephson junctions between two px-wave or two d-wave superconductors, the subgap Andreev bound states produce a 4π4π -periodic relation between the Josephson current I and the phase difference φ : I ∝ sin(φ/2). Consequently, the ac Josephson current has the fractional frequency eV/ħ, where V is the dc voltage. In the tunneling limit, the Josephson current is proportional to the first power (not square) of the electron tunneling amplitude. Thus, the Josephson current between unconventional superconductors is carried by single electrons, rather than by Cooper pairs. The fractional ac Josephson effect can be observed experimentally by measuring frequency spectrum of microwave radiation from the junction. We also study junctions between singlet s-wave and triplet px-wave, as well as between chiral px±ipy-wave superconductors.

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ID Code:81323
Deposited On:06 Feb 2012 05:06
Last Modified:18 May 2016 22:56

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