Quantum Tunneling

 

In quantum mechanics, quantum tunnelling (or the tunnel effect) is a nanoscopic phenomenon in which a particle violates the principles of classical mechanics by penetrating a potential barrier or impedance higher than the kinetic energy of the particle.[1] A barrier, in terms of quantum tunnelling, may be a form of energy state analogous to a "hill" or incline in classical mechanics, which classically suggests that passage through or over such a barrier would be impossible without sufficient energy.

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When electrons pass through a barrier, without overcoming it or breaking it down. See this illustration.

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When electrons pass through a barrier, without overcoming it or breaking it down. See this illustration.

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