Figure 4

Hot-electron quasiprobability distribution. Wigner quasiprobability distribution (a map to visualise the particle’s state in phase space by translating the wave function) plotted on the energy (E)-time (t) phase space using the time-dependent barrier described in Ref. [82]. \(E_{\mathrm{{0}}}\) and \(t_{\mathrm{{0}}}\) are arbitrarily chosen central values of the electron emission energy and arrival time. This plot shows that the quasi-probability distribution has a correlation between energy and time, implying that the emission energy is lifted as the electron leaves the source