KTHNY theory
= KTHNY theory
{wiki=KTHNY_theory}
KTHNY theory, or the Kosterlitz-Thouless-Halperin-Nelson-Young theory, is a theoretical framework in condensed matter physics that describes phase transitions in two-dimensional systems, particularly in the context of the superconducting and superfluid phase transitions. Named after its key contributors, David J. Thouless, J.