https://physicsoverflow.org/14851/why-cannot-fermions-have-non-zero-vacuum-expectation-value?show=14858
why cannot fermions have non-zero vacuum expectation value? | PhysicsOverflow
In quantum field theory, scalar can take non-zero vacuum expectation value(vev). And this way they break ... 13 11:31 (UCT), posted by SE-user Paul
vacuum expectation valuenon zerocannotfermionsphysicsoverflow