  The entanglement dynamics of a pair of donor-based charge qubits is obtained
in analytical form. The disentanglement is induced by off resonant scattering
of acoustical phonons in the semiconductor host. According to our results a
rather unusual recovery of entanglement occurs that depends on the geometrical
configuration of the qubits. In addition, for large times a non-vanishing
stationary entanglement is predicted. For the cases of one and two initial
excitations a simple kinetic interpretation allows for an adequate analysis of
the observed dynamics. Our results also reveal a direct relation between the
disentanglement rate and the inter-donor decoherence rates.
