Extended Data Fig. 4: Magneto-optical spectroscopy of device D1 at Vg ≈ 0 V.
From: Creation of moiré bands in a monolayer semiconductor by spatially periodic dielectric screening
a, Reflection contrast spectrum (ΔR/R0) as a function of out-of-plane magnetic field at the graphene Dirac point. The white light probe is left circularly polarized (σ+). b, The magnetic-field dependence of the 1s, 2s, 3s, …6s exciton energy is extracted from (a). The filled and empty symbols denote the values measured with σ+ and σ- light, respectively. The latter is equivalent to σ+ probe under a negative magnetic field. The red dashed lines are best fits of the Keldysh potential model as described in the text.
