Fig. 6
From: Joule overheating poisons the fractional ac Josephson effect in topological Josephson junctions
Thermally suppressed parity lifetime. Data extracted from Fig. 5b at two different radio-frequency powers Prf indicated by the black arrows in Fig. 5b, showing the voltage V normalized to hfrf/2e (a), Quasiparticle temperature Tqp (b), and the switching time τsw (c) versus current I normalized to the critical current Ic. At Prf = −112 dBm, the first Shapiro step is absent in the I − V. The increase of Tqp when a voltage sets in on Shapiro steps leads to an exponential suppression of τsw. When \(\tau _{{\mathrm{sw}}} \, < \, \tau _{\mathrm{J}}^{4\pi }\) (the phase relaxation time \(\tau _{\mathrm{J}}^{4\pi }\) is indicated by the black dotted line in c), poisoning suppresses the contribution of the 4π-periodic channel to the Shapiro steps n > 2, and all odd Shapiro steps are present in the I − V, see blue curve in (a)
