He is known for developing the path integral formulation of the Fermionic field, inventing Grassmann integration for this purpose.
Fermion | fermion | Majorana fermion |
Applications to the lattice fermion models such as Hubbard/Anderson models and to the Heisenberg model of ferro- and antiferromagnet, which manifest the operational ability of the method were given.
By the Pauli exclusion principle, no quantum state can be occupied by more than one fermion with an identical set of quantum numbers.
In 1974, Julius Wess and Bruno Zumino studied, using modern terminology, dynamics of a single chiral superfield (composed of a complex scalar and a spinor fermion) whose cubic superpotential leads to a renormalizable theory.