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Absolutely. At some point, the electrons in the transistor experience quantum tunneling - i.e. they jump over the gate. Which means it's not a very useful gate anymore...

See this great video about it : https://www.youtube.com/watch?v=67S4IyakRko

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There’s nothing special about quantum tunneling versus ordinary conduction. You lower the energy barrier, the probability of crossing the barrier increases exponentially. Think about how GAA works. Makes no sense from the electrostatic perspective, right? All it’s doing is lowering the tunneling barrier from source to drain. The issue with size is the ratio of energy states in the interfaces between materials versus bulk crystal.

Quantum tunneling can happen when no conduction is supposed to be happening which isn't desirable.

On the other hand, when we can master the QFET, quantum tunneling gets turned into a desirable trait with huge benefits.

https://en.wikipedia.org/wiki/QFET

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