In one system, these particles occur as poles of a Green’s function that is proportional to a weight symbolized Z-sub-k. Massless examples of these particles occur as excitations in a class of semimetals exemplified by tantalum arsenide. Interacting examples of these particles form quasiparticles in a model whose 1D case breaks down and is named for Luttinger. The expected occupancy of these particles is given by the function, “one over one plus an exponential,” which is bounded between zero and (*) one. Slater determinants (-5[1])are used to encode the anti-symmetry property of wavefunctions of these particles. Only one of these particles can occupy a given quantum state (-5[1])at a time due to the Pauli exclusion principle. For 10 points, name these particles with half-integer (10[1])spins, which are contrasted with bosons. ■END■