Extended Data Fig. 1: Additional examples of the ν=1 gap suppression by the presence of magnons.

a, Optical image of the device indicating the circuit used for magnon generation and the locations where the gap measurements were taken. b, Bias-dependent energy gap measured at location 2. The grey dotted lines mark ±E_Z. While the origin of the small asymmetry for |V_DC|< E_Z is unclear, its magnitude is much smaller than overall suppression observed at higher bias, and the top gate dependence shows that the onset consistently occurs near E_Z (see Fig. 2). c-g, Chemical potential µ near ν = 1 measured with V_DC = 0 mV (blue) and V_DC = 10 mV (red) at 6 different locations. Although the local value of the ν = 1 gap varies, its reduction by the presence of magnons is clearly reproduced in all the data sets.