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In quantum field theory, an order operator or an order field is a quantum field version of Landau's order parameter whose expectation value characterizes phase transitions. There exists a dual version of it, the disorder operator or disorder field, whose expectation value charaterizes a phase transition by indicating the prolific presence of defect or vortex lines in an ordered phase.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Order_operator". A list of authors is available in Wikipedia.|