Finite-temperature transport of a pinned 2D electron lattice

We argue that for a pinned 2D electron lattice in a magnetic field thermally activated bound dislocation pairs contribute to the conductivity from which an activation energy Edp can be deduced. Near the melting point, this activation energy Edp approaches zero as Edp=E₀(1-{ν}/ν₀), where {ν} is the filling factor. We calculate E₀ from the change in the zero-point energy of the phonons as a dislocation pair is created and find agreement to within 30% with the experimental result of Willet et al.