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Abstract
Energy relaxation from an excited to a ground state in a quantum dot is studied by DC current and pulse-excited current measurements. We find that all the excited states can be classified as short-lived or long-lived excited states, although they are too short or too long for us to determine the actual lifetime with our method. The relaxation time is short (less than a few ns) if the transition takes place by means of electron–phonon interaction, while it is very long (more than a few μs) if the transition involves a spin-flip. The crossover between long and short relaxation time is studied at a particular level crossing.
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