Extended Data Fig. 3: Transition between Mott insulator and EI states at n = −1 probed by MIM spectra.
From: Excitonic insulator in a heterojunction moiré superlattice
(a) Schematic of a dual gated 1L/2L WS2/WSe2 device D1, same as the device in Fig. 1, but in a region with a monolayer graphene (MLG) as the top gate. (b) Schematic of expected MIM features in a dual gate MIM map. (c)–(e) are color plots of MIM spectra as a function of top gate and back gate voltages for 1L/2L WS2/WSe2 region at 20 K (c) and at 70 K (d), and for 1L/1L WS2/WSe2 region at 70 K (e), respectively. The top panels are MIM-Im data and the bottom panels are MIM-Re data.
