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\section{Resonant Tunneling Diode}  As previously stated, an RTD is a tunneling device that makes use of resonances in the tunneling probability for diode control. This resonance arises from the interaction of the potential barriers, which can be thought of as a double potential barrier with adjustable positions relative to each other. When an electron tunnels through one barrier, it will be temporarily bound between the two barriers until it can tunnel out\cite{Mizuta_1995}. The relative positional adjustment of the barriers, which in actuality is the result of applying a bias to the device, results in adjustability of the amount of time the electron is bound. As At  a certain bias, the tunneling probability spikes and the electron sees virtually no barriers; this is the resonance condition. Using tunneling probability, current can be calculated and has been shown to exhibit unique properties that include a negative differential resistance region\cite{Kluksdahl_1989}. These properties have made RTD's very useful for switching devices as well as a platform for studying the wave nature of electrons.