Fractional ac Josephson effect in p- and d-wave superconductors
By H. Kwon, Krishnendu Sengupta, Victor M. Yakovenko. 2002
279 citations recorded by the source corpus.
For certain orientations of Josephson junctions between two px-wave or two d-wave superconductors, the subgap Andreev bound states produce a $4\pi$-periodic relation between the Josephson current I and the phase difference $\phi$: $I\propto\sin(\phi/2)$. Consequently, the ac Josephson current has the fractional frequency $eV/\hbar$, 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 $p_x\pm ip_y$-wave superconductors.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/8a0c45c911776327baaae20c4700040b2bafcc40
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Josephson radiation from gapless Andreev bound states in HgTe-based topological junctions (2016, background): “Such states can in principle be detected via the resulting energy dispersion that is 4π-periodic in φ, with, in the simplest case of a short junction, E = EJ cosφ/2 [4, 5].”
- Reproducing topological properties with quasi-Majorana states (2018, background): “In addition to their non-Abelian properties, Majorana states have local signatures, namely 4π-periodicity of the supercurrent in a topological Josephson junction [7, 8], and a quantized zero-bias conductance peak in the tunneling spectroscopy of a single topological wire [9–11].”