Josephson radiation from gapless andreev bound states in HgTe-based topological junctions

Review (2017)

Authors

R. S. Deacon RIKEN Center for Emergent Matter Science (CEMS)
J Wiedenmann University of Würzburg
H Buhmann University of Würzburg
Laurens W. Molenkamp University of Würzburg
E Bocquillon University of Würzburg
F. Domínguez University of Würzburg
T.M. Klapwijk Kavli institute of nanoscience Delft, QN/Klapwijk Lab
P. Leubner University of Würzburg
C Brüne University of Würzburg
E. M. Hankiewicz University of Würzburg
S Tarucha RIKEN Center for Emergent Matter Science (CEMS), University of Tokyo
K Ishibashi RIKEN Center for Emergent Matter Science (CEMS)
Research Group
QN/Klapwijk Lab
Copyright: © 2017 R. S. Deacon, J Wiedenmann, E Bocquillon, F. Domínguez, T.M. Klapwijk, P. Leubner, C Brüne, E. M. Hankiewicz, S Tarucha, K Ishibashi, H Buhmann, Laurens W. Molenkamp
DOI: https://doi.org/10.1103/PhysRevX.7.021011
More Info
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Published Date

20-04-2017

Language

English

Research Group

QN/Klapwijk Lab

Abstract

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 fj rather than conventional emission at fj. 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 fj=2. The linewidths of emission lines indicate a coherence time of 0.3-4 ns for the fj=2 line, much shorter than for the fj 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.