Extended Data Fig. 3: Rxx thermometry.
a, Circuit used for Rxx measurements. Contacts 2 and 3 are used to generate magnons. Contacts 1, 6, 5, and 4 are used to measure Rxx. The white arrows indicate the chirality of the current flow. b, Rxx as a function of VDC at VBG = 3.8 V. The value of Rxx tends to saturate for |VDC| greater than ~4EZ, suggesting that the temperature saturates. c, Individual Rxx traces measured at base temperature with various values of VDC applied to contact 3 near ν=1 using the circuit shown in a. The center of the ν=1 plateau is around a back gate voltage of 3.5 V. d, Individual Rxx traces measured at various temperatures with zero DC bias applied to contact 3 near ν=1 using the circuit shown in a. e, Individual Rxx traces measured at base temperature with 10 mV applied to contact 3 (blue dots) and at various temperatures with 0 mV applied to contact 3 (orange, yellow and purple lines). The close agreement between the blue dotted line and the red line suggests that the effect of magnon generation on the Rxx measurement is primarily due to heating. These measurements also demonstrate that the increase in temperature due to magnon generation does not exceed 4.5 K at VDC = -10 mV.
