Probing the dynamics of Andreev states in a coherent Normal/Superconducting ring

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • F. Chiodi
  • M. Ferrier
  • K. Tikhonov
  • P. Virtanen
  • T.T. Heikkilä
  • M. Feigelman
  • S. Guéron
  • H. Bouchiat

Research units

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.

Details

Original languageEnglish
Article number3
Pages (from-to)1-6
JournalScientific Reports
Volume1
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

    Research areas

  • electronic materials and devices, nanotechnology, quantum physics, superconductivity

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