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SUMMARY:Majorana metals and quantum spin liquids - Maria Hermanns\, Univer
 sity Köln
DTSTART:20141113T141500Z
DTEND:20141113T151500Z
UID:TALK54147@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:One of the most intriguing phenomena in strongly correlated sy
 stems is the fractionalization of quantum numbers — familiar examples in
 clude the spin-charge separation in one-dimensional metallic systems\, the
  fractionalization of the electron in fractional quantum Hall states or th
 e emergence of monopoles in spin ice.\n\nIn this talk\, I will discuss the
  fractionalization of magnetic moments in a certain class of Mott insulato
 rs\, in which the emergent degrees of freedom are Majorana fermions that f
 orm an (almost) conventional metal. The origin of such a dichotomous state
  is elucidated by a family of exactly solvable models of frustrated quantu
 m magnets in three dimensions\, which might be realized in a class of rece
 ntly synthesized Iridate compounds. These models thereby provide the first
  analytical tractable examples of long sought-after quantum spin liquids w
 ith a spinon Fermi surface and even an entire new class of quantum spin li
 quids — a so-called Weyl spin liquid\, in which the fractionalized degre
 es of freedom form a topological semi-metal.\n \n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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