Fig. 2: Measured distribution functions.
From: Relaxation and revival of quasiparticles injected in an interacting quantum Hall liquid

Top panel: measured f(E) for L = 480 nm. Each curve, offset for clarity, corresponds to an increment of the injection energy δE1 ≈ 21 μeV, from E1 = −21 μeV (blue) where no additional quasiparticles are emitted, to E1 = 173 μeV (red). The thick gray line is a Fermi function fit of the data at E1 = −21 μeV. Bottom panel: measured f(E) for L = 750 nm. Each curve corresponds to a increment of the injection energy δE1 ≈ 9 μeV, up to E1 = 121 μeV (red). The inset is a zoom on the region delimited by the dashed-line square. In all panels, the vertical offset is equal to 5.5 × 103δE1.