Extended Data Fig. 4: Ballistic spreading simulation.
From: Observation of giant and tunable thermal diffusivity of a Dirac fluid at room temperature
a, Time-dependent output distributions for quantum mechanical calculations for a single electron (top row) and an ensemble of independent electrons (bottom row). b, Resulting width σball2 for ballistic transport for the Monte Carlo method with varying Fermi velocities, as well as the quantum calculation for an ensemble of independent electrons. Both calculations essentially agree and the spread within 0.25 ps leads to final widths of below 0.25 µm2 for realistic values of the Fermi velocity.
