Extended Data Fig. 6: Optical characterization of device 2 at 1.7 K.
From: Evidence of frustrated magnetic interactions in a Wigner–Mott insulator

a, Filling-dependent reflectance contrast (RC) spectrum. Enhanced RC near the fundamental moiré exciton resonance of WSe2 is observed only at integer filling factors. The absence of the RC enhancement at 𝜈 = 1/3 and 2/3 supports the absence of these Wigner-Mott insulator states. b, Linecut of a at 1.673 eV.