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Symmetry and symnetry fractionalization in frustrated magnets

Ian McCulloch, University of Queensland, Australia

06.07.2017 at 10:00 

I will describe some recent calculations using matrix product state methods to determine the phase diagram of the J1-J2 Heisenberg model on the triangular lattice.
The momentum-resolved entanglement spectra encodes detailed information on symmetry properties and was used to detect symmetry broken ordering and a probable topological spin liquid phase.
Higher moments of the order parameter give Binder-cumulant-like scaling quantities that can detect phase boundaries even when using SU(2) symmetry adapted basis sets where the order parameter itself is strictly zero.

A 318, Theresienstr. 37