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SUMMARY:Magnetic monopoles in spin ice - Dr Claudio Castelnovo (University
  of Oxford)
DTSTART:20080117T141500Z
DTEND:20080117T151500Z
UID:TALK9313@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:Electrically charged particles\, such as the electron\, are\nu
 biquitous. By contrast\, no elementary particles with a net magnetic\nchar
 ge have ever been observed\, despite intensive and prolonged\nsearches. We
  pursue an alternative strategy\, namely\nthat of realizing them not as el
 ementary but rather as emergent\nparticles\, i.e.\, as manifestations of t
 he correlations present in a\nstrongly interacting many-body system. Here 
 we\nshow that magnetic monopoles do emerge in a class of exotic\nmagnets k
 nown collectively as spin ice: the dipole moment of the\nunderlying electr
 onic degrees of freedom fractionalises into monopoles\nin a process that w
 e term Dirac string condensation. 
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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