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The simplest model of an RTD consists of an electron incident on a double barrier potential (Figure \ref{fig:barrier}). The two potential barrier regions are achieved by fabricating a heterostructure. This is a famous well known  setup, and can been solved in detail by solving for the transmission coefficient $T(E)$. It is seen that unlike a single barrier setup, for which the transmission coefficient is always less than one, a double barrier leads to a fully transmitting setup at certain electron energies (or barrier separation). This means there is no scattering of electrons and the electrons effectively do not see any barrier.\cite{bohm2012quantum} These energies are the resonant energy modes of the setup.