Anyone know lots about Tunnel Diodes? I have a poorly phrased question

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Tunnel diodes can achieve a 100% transmission rate through both potential barriers due to the unique interaction of wavefunctions across the barriers. Unlike a single barrier scenario, where the wavefunction interacts with one barrier at a time, the dual barriers create a system that influences the entire wavefunction simultaneously. This phenomenon highlights the importance of considering the entire system rather than analyzing barriers in isolation. The piecewise analysis often used is merely a mathematical tool for convenience. Understanding these principles is crucial for grasping the behavior of tunnel diodes.
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Can somebody help me understand why it is possible to have a 100% transmission rate through both potential boundaries created by a tunnel diode, while the transmission rate through only one of the walls can be very small??
 
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The fact there are two barriers in the second example and only one in the first is what makes the difference - the wavefunctions do not interact with one barrier and then the other one - but the two barriers together make an entire system that informs the whole wavefunction in one go.

The peicewise analysis you may have met is just a mathematical convenience.
 
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