  We study a spin pump on a two-leg ladder chain of the Rice--Mele model. To
characterize the spin pump, we propose the Chern number for the many-body
ground state of the entanglement Hamiltonian, which is referred to as the
entanglement Chern number. We show that this model has two phases distinguished
by the entanglement Chern numbers. These two phases can be experimentally
verified in cold atoms.
