Departmental Seminar

Topological states in frustrated magnets

Dr Ian McCulloch
University of Queensland

The triangular lattice is an archetype example of a frustrated lattice, that was conjectured by Phil Anderson many years ago to have a topologically ordered resonating valence bond ground-state. This appears& to be realized in the J1-J2 heisenberg model on the triangular lattice, with an extended topologically ordered region in the vicinity of J2/J1=1/8.  I will describe how translationally matrix product state calculations for an infinite cylinder can uncover most of the properties of the topological phase using algebraic features such as the symmetries of the entanglement spectrum.

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