Abstract:
Self-assembled arrays of Ge-Si clusters with sizes of $\sim10\,$nm and a density of $\sim10^{10}\,$cm$^{-2}$ have been grown by molecular beam epitaxy. Stable steady-state field electron emission from such clusters has been observed and studied. The emission is characterized by resonance current peaks, which are explained by the quantization of the electron energy in nanoclusters. The estimation of the ground level energy from their emission measurements coincides with estimates obtained by other methods.