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We estimate the critical size of the initial nucleus of the low current statein a bistable resonant tunneling structure which is needed for this nucleus todevelop into a lateral switching front. Using the results obtained fordeterministic switching fronts, we argue that for realistic structuralparameters the critical nucleus has macroscopic dimensions and therefore is toolarge to be created by stochastic electron noise.Comment: the extended version of the Comment on "Lifetime of metastable states  in resonant-tunneling structures" to appear in Phys. Rev.

Comment on “Lifetime of metastable states in resonant tunneling structures”