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HL: Fachverband Halbleiterphysik
HL 87: Low-dimensional systems: Topological order 2 (TT with DS/HL/MA/O)
HL 87.2: Vortrag
Donnerstag, 19. März 2015, 15:15–15:30, H 3010
Symmetry fractionalization in SU(2n) antiferromagnetic Heisenberg chains — •Andreas Weichselbaum1 and Thomas Quella2 — 1Ludwig Maximilians University, Munich, Germany — 2University of Cologne, Germany
We explore generalizations of the Affleck-Kennedy-Lieb-Tasaki (AKLT, 1987) model for spin-1 antiferromagnetic Heisenberg chains to higher-rank SU(2n) symmetries. In particular we show that by proper tuning of higher order spin interactions there also exist exact low-dimensional matrix-product ground states with fractionalized edge states. These states are adiabatically connected to the ground state of the plain SU(2n) Heisenberg model. The parameter space is explored using state of the art density matrix renormalization group (DMRG), explicitly utilizing SU(N) symmetry up to N=6 based on the QSpace tensor library.