We report on the existence of transmission zeros in quantum waveguide structures with resonantly coupled cavities. Such zeros do not occur in the usual double-barrier resonant tunneling systems. For quantum waveguides, the transmission probability exhibits pairs of poles and zeros in the complex-energy plane. The observed sharp structure of the transmission resonances and zeros can be understood in terms of these zero-pole pairs.
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Porod et al. (1992) studied this question.
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