Energy distribution of the ballistic hot electrons and holes emitted from a quantum point contact and probed by a quantum dot

We present measurements on the energy distribution profile of the ballistic hot carriers emitted from a quantum point contact. The hot carriers were injected to a quantum dot using magnetic focusing technique and analyzed by measuring differential conductance of the quantum dot. We found a thermally broadened energy distribution of the hot carriers near the bias voltage applied to the quantum point contact in an otherwise uniform distribution down to the equilibrium Fermi energy. We also measured an occupation ratio of available states by the injected hot carriers, and fully characterized their energy distribution profile. (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.