Fig. 3: Chemical potential measurements and comparison with the single-particle model.
From: Evidence for equilibrium exciton condensation in monolayer WTe2
a, Schematic of the device structure used to measure the chemical potential versus doping. In parallel with (below) the monolayer WTe2 is a graphene sheet, which is maintained at its Dirac point so that the electric field beneath the WTe2 is zero. The doping ng and chemical potential μ are then obtained from the voltages as shown (see text). The hBN dielectric between the layers is not shown. b, Measurements of μ (black) and conductance Gp (red) versus ng on monolayer WTe2 device MW12. The length of the green bars indicates the thermal energy, kT. c, Single-particle density of states D(E) that reproduces the low-temperature μ–ng behaviour. d, Calculated μ (black line), electron density n (red dotted line) and hole density p (blue dashed line) using this D(E) at the same temperatures as the measurements.
