Thanks that helped a lot to clarify. I have just only one more doubt: I don't know if it's correct but when i think about a poential step I naively think about the classic ball that must overcome the slope of an hill, but once it reaches the top (overcome the potential barrier) i can't see what...
I'm referring inside the barier, but in the case of a step potential like in the picture:
The book is "Quantum Mechanics" by Claude Choen-Tannoudji, Bernard Diu, and Franck Laloe. (I don't know if it will help but the pages where it's discussed are 65-68, 75-77 and in particular the question i...
We know that thanks to the tunnel effect, in the case of a finite potential step (V) and considering a stationary state, when a plane wave with energy E < V encounter the step the probabability that the wave-particle coming from -∞ (where potential is V=0) will be ≠ 0, in particular the wave...