INVITADO:Belén Paredes.
Universidad Autónoma de Madrid / CSIC

Date:30 de enero, 2013 
Place:3rd floor seminar lecture room. Dpt. Física Teórica I. Facultad de Ciencias Físicas UCM.


Topological  states of matter represent  an exotic organizational form of quantum matter  that contradicts the traditional paradigms of condensed matter physics. Our understanding of how topological order emerges from
the microscopic  degrees of freedom of  a  quantum manyXbody system  is far from complete. Especially intriguing is the possible formation of nonX Abelian  topological phases, whose  excitations display nonXAbelian braiding properties with potential application for quantum computing.
In  this talk  I  will propose  a  physical  mechanism for the formation of topological states: the organization of particles into identical indistinguishable groups. I will argue that such global organization can give rise to topological quasiparticles obeying nonXAbelian statistics.To illustrate the construction, I will present a physical realization of this type of order in a spin lattice model.In theground state, spins are organized in 
two  identical quantum  loop condensates. Excitations with  nonXAbelian braiding properties are created by opening loops in each of the copies.
My  proposal  might  open  a  door  for  the  understanding  of  the origin  of topological states of matter and for the experimental realization of nonX Abelian anyons in the laboratory.