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Colloquia
Colloquium
Friday, February 6, 2015
3:30 PM
Physics Building, Room 204

GiaWei Chern
[Host: Joe Poon]
Los Alamos National Lab
"Stiffness from disorder in frustrated quasitwodimensional magnets"

ABSTRACT:
Frustrated magnetism has become an extremely active field of research. The concept of geometrical frustration dates back to Wannier’s 1950 study of Ising antiferromagnet on the triangular lattice. This simple system illustrates many defining characteristics of a highly frustrated magnet, including a macroscopic groundstate degeneracy and the appearance of powerlaw correlations without criticality. In this talk I will discuss a simple generalization of the triangular Ising model, namely, a finite number of vertically stacked triangular layers. Our extensive numerical simulations reveal a low temperature reentrance of two BerezinskiiKosterlitzThouless transitions. In particular, I will discuss how shortdistance spinspin correlations can be enhanced by thermal fluctuations, a phenomenon we termed stiffness from disorder. This is a generalization of the wellknown orderbydisorder mechanism in frustrated magnets. I will also present an effective field theory that quantitatively describes the lowtemperature physics of the multilayer triangular Ising antiferromagnet.




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