We describe photon-assisted tunneling (PAT) between discrete zero-dimensional (0D) levels in two weakly coupled quantum dots. Resonant tunneling current with multiple (up to three) photon absorption is observed when the two 0D levels are separated by a multiple of the microwave photon energy. The PAT current shows a Bessel function dependence on the microwave power, which is in agreement with time-dependent tunneling theory. The sharp PAT peaks can be well resolved even when the high microwave power increases electron temperature in the reservoirs.
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Fujisawa et al. (1997) studied this question.
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