Dislocation pair unbinding

However, there is a small bump in the specific heat above [85], representing the entropy associated with unbinding dislocation pairs. This feature may be unobservably small, however, because the density of such pairs is assumed to be small. 

It is interesting to contrast this melting model with the KTHNY theory. In the KTHNY theory, 2D melting is associated with the unbinding of a dilute gas of thermally generated, bound dislocation pairs,... 

At this point we also note the relation to the Halperin-Nelson (1978)-Young (1978) theory of continuous melting in two dimensions via an unbinding of dislocation pairs. Writing the Hamiltonian in terms of the strain tensor afi = J[dtip/dxa -(- < Uq/... 

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