Phonon bottleneck in graphene-based Josephson junctions at millikelvin temperatures.

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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.





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Borzenets, IV, UC Coskun, HT Mebrahtu, Yu V Bomze, AI Smirnov and G Finkelstein (2013). Phonon bottleneck in graphene-based Josephson junctions at millikelvin temperatures. Physical review letters, 111(2). p. 027001. 10.1103/physrevlett.111.027001 Retrieved from

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Gleb Finkelstein

Professor of Physics

Gleb Finkelstein is an experimentalist interested in physics of quantum nanostructures, such as Josephson junctions and quantum dots made of carbon nanotubes, graphene, and topological materials. These objects reveal a variety of interesting electronic properties that may form a basis for future quantum devices.

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