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So yes, if you compute the Poynting vector (energy flux density), $\vec E \times \vec H$, for an exponentially decaying evanescent wave, you indeed find zero time-averaged energy flux perpendicular to the reflecting plane. Ask you say, this leads to a conundrum --- how do evanescent waves transfer energy across barriers? For sure, we know they can transfer ...


The electron does not deposit energy in the oxide layer. The oxide layer provides for a potential barrier, the electron moves though it despite the fact that in a classical picture the electron should have a negative kinetic energy there. You can consider a process where the electron is going to do some damage to the oxide layer, but such a process is only ...

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