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The groundstates and phases of the two-dimensional fully frustrated XY model
Umeå University, Faculty of Science and Technology, Department of Physics. (Statistisk fysik)
Umeå University, Faculty of Science and Technology, Department of Physics. (Statistisk fysik)
2009 (English)In: International Journal of Modern Physics B, ISSN 0217-9792, Vol. 23, no 20-21, 3939-3950 p.Article in journal (Refereed) Published
Abstract [en]

The 2D Fully Frustrated XY(FFXY) class of models is shown to contain a new groundstate in addition to the checkerboard groundstate of the standard 2D XY model. The spin configuration of this additional groundstate is obtained and its connection to a broken Z2-symmetry explained. This means that the class of 2D FFXY models belongs within a U(1) ⊗ Z2 ⊗ Z2-symmetry phase-transition representation. The phase diagram is reviewed and the central charges of the four multicritical points described. The implications for the standard 2D FFXY-model are discussed and elucidated, in particular with respect to the long standing controversy concerning the phase transitions of the standard 2D FFXY-model.

Place, publisher, year, edition, pages
Singapore: World Scientific , 2009. Vol. 23, no 20-21, 3939-3950 p.
Keyword [en]
phase transitions
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-32479DOI: 10.1142/S0217979209063171OAI: oai:DiVA.org:umu-32479DiVA: diva2:303389
Available from: 2010-03-12 Created: 2010-03-12 Last updated: 2017-12-12Bibliographically approved

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Minnhagen, PetterBernhardsson, Sebastian

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