Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • U. C. Coskun
  • H. T. Mebrahtu
  • Yu V. Bomze
  • A. I. Smirnov
  • G. Finkelstein

Detail(s)

Original languageEnglish
Article number027001
Journal / PublicationPhysical Review Letters
Volume111
Issue number2
Online published9 Jul 2013
Publication statusPublished - 12 Jul 2013
Externally publishedYes

Abstract

We examine the nature of the transitions between the normal and superconducting branches in superconductor-graphene-superconductor Josephson junctions. We attribute the hysteresis between the switching (superconducting to normal) and retrapping (normal to superconducting) transitions to electron overheating. In particular, we demonstrate that the retrapping current corresponds to the critical current at an elevated temperature, where the heating is caused by the retrapping current itself. The superconducting gap in the leads suppresses the hot electron outflow, allowing us to further study electron thermalization by phonons at low temperatures (T≤ 1 K). The relationship between the applied power and the electron temperature was found to be P ∝ T3, which we argue is consistent with cooling due to electron-phonon interactions.

Citation Format(s)

Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures. / Borzenets, I. V.; Coskun, U. C.; Mebrahtu, H. T. et al.
In: Physical Review Letters, Vol. 111, No. 2, 027001, 12.07.2013.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review