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SUMMARY:Fictitious spin waves in a frustrated classical antiferromagnet - 
 Stefan Schnabel\, University of Leipzig
DTSTART:20130306T111500Z
DTEND:20130306T121500Z
UID:TALK42906@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:In the last decades the classical Heisenberg antiferromagnet o
 n the kagome lattice has been subject of a number of theoretical and numer
 ical studies and today its behavior is widely understood. A prominent feat
 ure is 'ordering by disorder' meaning the entropy-driven formation of a hi
 ghly degenerate coplanar state at low temperatures. For the coplanar regim
 e a recent numerical study using standard spin dynamics techniques suggest
 s the existences of an optical branch of spin waves while analytical inves
 tigations predict only acoustic modes. We were able to show how this discr
 epancy arises from different descriptions of the system and that the struc
 ture of the low-temperature state causes shifts in Fourier space\, thus cr
 eating a fictitious optical branch.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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