Probing the dynamics of Andreev states in a coherent normal/superconducting ring.

Scientific Reports
F ChiodiH Bouchiat

Abstract

The supercurrent that establishes between two superconductors connected through a normal N mesoscopic link is carried by quasiparticule states localized within the link, the "Andreev bound states (ABS)". Whereas the dc properties of this supercurrent in SNS junctions are now well understood, its dynamical properties are still an unresolved issue. In this letter we probe this dynamics by inductively coupling an NS ring to a multimode superconducting resonator, thereby implementing both a phase bias and current detection at high frequency. Whereas at very low temperatures we essentially measure the phase derivative of the supercurrent, at higher temperature we find a surprisingly strong frequency dependence in the current response of the ring: the ABS do not follow adiabatically the phase modulation. This experiment also illustrates a new tool to probe the fundamental time scales of phase coherent systems that are decoupled from macroscopic normal contacts and thermal baths.

References

Apr 1, 1986·Physical Review. B, Condensed Matter·M Büttiker, T M Klapwijk
Nov 15, 1988·Physical Review. B, Condensed Matter·N Trivedi, D A Browne
Jul 15, 1994·Physical Review. B, Condensed Matter·B Reulet, H Bouchiat
Nov 1, 1996·Physical Review. B, Condensed Matter·Y M Blanter
Jun 4, 2008·Physical Review Letters·H le SueurD Esteve
Nov 13, 2009·Physical Review Letters·F ChiodiB Reulet
Sep 28, 2010·Physical Review Letters·Pauli VirtanenJuan Carlos Cuevas

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Citations

Jan 6, 2016·Journal of the American Chemical Society·Satoshi KanekoManabu Kiguchi
Oct 12, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Serena EleyNadya Mason
Apr 15, 2014·Physical Review Letters·A D ChepelianskiiR H Friend
Jun 12, 2013·Physical Review Letters·B DassonnevilleH Bouchiat

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Methods Mentioned

BETA
electron-phonon scattering
electron-electron scattering
chip

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