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

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:10.1103/PhysRevX.7.021011

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

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

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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 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.

Original language	English
Article number	021011
Number of pages	7
Journal	Physical Review X
Volume	7
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevX.7.021011
Publication status	Published - 20 Apr 2017

Keywords

Condensed matter physics

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10.1103/PhysRevX.7.021011

PhysRevX.7.021011Final published version, 1.06 MBLicence: CC BY

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title = "Josephson radiation from gapless andreev bound states in HgTe-based topological junctions",

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.",

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AU - Deacon, R. S.

AU - Wiedenmann, J

AU - Bocquillon, E

AU - Domínguez, F.

AU - Klapwijk, T. M.

AU - Leubner, P.

AU - Brüne, C

AU - Hankiewicz, E. M.

AU - Tarucha, S.

AU - Ishibashi, K

AU - Buhmann, H

AU - Molenkamp, Laurens W.

PY - 2017/4/20

Y1 - 2017/4/20

N2 - 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.

AB - 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.

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JO - Physical Review X

JF - Physical Review X

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M1 - 021011

ER -

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

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