In statistical mechanics , the KTHNY-theory describes the process of melting of crystals in two dimensions (2D). The name is derived from the initials of the surnames of John Michael Kosterlitz , David J. Thouless ,[ 1] [ 2] Bertrand Halperin , David R. Nelson ,[ 3] [ 4] and A. Peter Young,[ 5] who developed the theory in the 1970s. It is, beside the Ising model in 2D and the XY model in 2D,[ 6] [ 7] one of the few theories, which can be solved analytically and which predicts a phase transition at a temperature
T
>
0
{\displaystyle T>0}
.
^ Kosterlitz, J.M.; Thouless, D.J. (1972). "Long Range Order and Metastability in Two-Dimensional Solids and Superfluids". Journal of Physics C . 5 : 124. doi :10.1088/0022-3719/5/11/002 .
^ Kosterlitz, J.M.; Thouless, D.J. (1973). "Ordering Metastability, and Phase Transitions in Two-Dimensional Systems". Journal of Physics C . 6 (1181): 1181– 1203. Bibcode :1973JPhC....6.1181K . doi :10.1088/0022-3719/6/7/010 .
^ Halperin, B.I.; Nelson, D.R. (1978). "Theory of Two-Dimensional Melting" . Physical Review Letters . 41 (2): 121– 124. Bibcode :1978PhRvL..41..121H . doi :10.1103/PhysRevLett.41.121 .
^ Nelson, D.R.; Halperin, B.I. (1979). "Dislocation-mediated melting in two dimensions". Physical Review B . 19 (5): 2457– 2484. Bibcode :1979PhRvB..19.2457N . doi :10.1103/PhysRevB.19.2457 .
^ Young, P.A. (1979). "Melting and the vector Coulomb gas in two dimensions". Physical Review B . 19 (4): 1855– 1866. Bibcode :1979PhRvB..19.1855Y . doi :10.1103/PhysRevB.19.1855 .
^ Kosterlitz, J.M. (1974). "The critical properties of the two-dimensional XY model". Journal of Physics C . 7 (6): 1046– 1060. Bibcode :1974JPhC....7.1046K . doi :10.1088/0022-3719/7/6/005 .
^ Nelson, D.R.; Kosterlitz, J.M. (1977). "Universal Jump in the Superfluid Density of Two-Dimensional Superfluids" . Physical Review Letters . 39 (19): 1201– 1205. Bibcode :1977PhRvL..39.1201N . doi :10.1103/PhysRevLett.39.1201 .