deletions | additions       diff --git a/The_simplest_model_of_an__.tex b/The_simplest_model_of_an__.tex  index 811d002..55a127f 100644  --- a/The_simplest_model_of_an__.tex  +++ b/The_simplest_model_of_an__.tex 
...
The simplest model of an RTD consists of an electron incident on a double barrier potential (as shown in the above figure). (Figure \ref{fig:barrier}).  The two potential barrier regions are achieved by fabricating a heterostructure. This is a famous 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.