Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures

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

doi:10.1103/PhysRevLett.111.027001

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Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures

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

DOI 10.1103/PhysRevLett.111.027001 · Physical Review Letters

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	onset