Self-heating effects and switching dynamics in graphene multiterminal Josephson junctions

We experimentally investigate the electronic transport properties of a three-terminal graphene Josephson junction. We find that self-heating effects strongly influence the behavior of this multiterminal Josephson junction (MTJJ) system. We show that existing simulation methods based on resistively and capacitively shunted Josephson junction networks can be significantly improved by taking into account these heating effects. We also investigate the phase dynamics in our MTJJ by measuring its switching current distribution and find correlated switching events in different junctions. We show that the switching dynamics is governed by phase diffusion at low temperatures. Furthermore, we find that self-heating introduces additional damping that results in overdamped <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>I</a:mi><a:mo>−</a:mo><a:mi>V</a:mi></a:mrow></a:math> characteristics when normal and supercurrents coexist in the device. Published by the American Physical Society 2024