期刊
PHYSICAL REVIEW X
卷 7, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.7.021011
关键词
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资金
- German Research Foundation [SFB1170]
- Elitenetzwerk Bayern program Topologische Isolatoren
- European Research Council [339306]
- Ministry of Education and Science of the Russian Federation [14.B25.31.007]
- MEXT [26220710]
- ImPACT Program of Council for Science, Technology and Innovation
- Alexander von Humboldt foundation
- [26790008]
- [16H02204]
- Grants-in-Aid for Scientific Research [15H05867, 26220710, 26790008, 15H05866] Funding Source: KAKEN
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 enable the detection 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(J)/2. The linewidths of emission lines indicate a coherence time of 0.3-4 ns for the f(J)/2 line, much shorter than for the f(J) line (3-4 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.
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