Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures

摘要: We examine the nature of transitions between normal and superconducting branches in superconductor-graphene-superconductor Josephson junctions. attribute hysteresis switching (superconducting to normal) retrapping (normal superconducting) electron overheating. In particular, we demonstrate that current corresponds critical at an elevated temperature, where heating is caused by itself. The gap leads suppresses hot outflow, allowing us further study thermalization phonons low temperatures ($T\ensuremath{\lesssim}1\text{ }\text{ }\mathrm{K}$). relationship applied power temperature was found be $P\ensuremath{\propto}{T}^{3}$, which argue consistent with cooling due electron-phonon interactions.