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 (15[1])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 particles of this type is given by the function, “one over one plus an exponential,” which is bounded between zero and (*) one. Slater determinants are used to encode the anti-symmetry property (10[1])of wavefunctions (10[1])of particles of this type. Only one particle of this type can occupy a given quantum state at a time (10[1])due to the (10[1])Pauli exclusion principle. For 10 points, name these particles with half-integer spins, which are contrasted with bosons. ■END■