Extended Data Fig. 9: Robust ν = 5/3 state.

Local inverse compressibility \(d\mu /dn\) measured for 0< ν < 2. In contrast to local compressibility studies performed on suspended monolayer graphene devices, a prominent peak at ν = 5/3—comparable in strength to those at 1/3 and 2/3, and stronger than that at 4/3—is evident, suggesting that valley skyrmion formation in the device is disfavored.