  We introduce a class of spinless fermion models that exhibit quantum
many-body scars (QMBS) originating from kinetic constraints in the form of
density-assisted hopping. The models can be defined on any lattice in any
dimension and allow for spatially varying interactions. We construct a tower of
exact eigenstates with finite energy density, and we demonstrate that these
QMBS are responsible for the nonthermal nature of the system by studying the
entanglement entropy and correlation functions. The quench dynamics from
certain initial states is also investigated, and it is confirmed that the QMBS
induce nonthermalizing dynamics. As another characterization of the QMBS, we
give a parent Hamiltonian for which the QMBS are unique ground states. We also
prove the uniqueness rigorously.
