Josephson radiation from gapless Andreev bound states in HgTe-based topological junctions
By R. Deacon, J. Wiedenmann, E. Bocquillon, F. Dom'inguez, T. Klapwijk, P. Leubner, C. Brune, E. Hankiewicz, S. Tarucha, K. Ishibashi and 2 more. 2016
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Frequency analysis of the rf emission of oscillating Josephson supercurrent is a powerful passive way of probing properties of topological Josephson junctions. In particular, measurements of the Josephson emission enables to detect the expected presence of topological gapless Andreev bound states that give rise to emission at half the Josephson frequency $f_J$, rather than conventional emission at $f_J$. Here we report direct measurement of rf emission spectra on Josephson junctions made of HgTe-based gate-tunable topological weak links. The emission spectra exhibit a clear signal at half the Josephson frequency $f_{\rm J}/2$. The linewidths of emission lines indicate a coherence time of $0.3-\SI{4}{ns}$ for the $f_{\rm J}/2$ line, much shorter than for the $f_{\rm J}$ line ($3-\SI{4}{ns}$). These observations strongly point towards the presence of topological gapless Andreev bound states, and pave the way for a future HgTe-based platform for topological quantum computation.
Subfields: Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/c0e8fbffb4b1647d306e4e9cb44fea2ff6f57f86
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Topological superconductors: a review (2016, background): “The experimental situation for induced 1D superconductivity in the topological edge states of the 2D topological insulator HgTe is probably more promising; for example, it has been shown that proximity-induced superconductivity is clearly established in the 1D helical edge states [241] and the recen”