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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 56: Correlated Electrons: Quantum-Critical Phenomena – Theory

TT 56.6: Talk

Wednesday, March 18, 2015, 10:45–11:00, A 053

Deconfined quantum criticality beyond designer Hamiltonians — •Ribhu K. Kaul1 and Thomas C. Lang21University of Kentucky, Lexington, USA — 2Boston University, Boston, USA

The SU(6) symmetric generalization of the Hubbard model on the square lattice constitutes a candidate for a direct, continuous quantum phase transition from Néel to valence bond solid (VBS) order. By constructing dimensionless quantities such as ratios of the magnetic structure factor and valence bond correlations we are able to unambiguously determine the existence of weak, but robust antiferromagnetic order in the weak coupling regime and a plaquette VBS in the strong coupling limit. Furthermore these ratios provide a tool to accurately determine the (critical) point from both sides of the phase transition separating the two limits. Preliminary results suggest a direct continuous transition for which we extract basic estimates for the critical exponents and compare the scaling function with results from designer SU(6) spin models to investigate whether this quantum phase transition is compatible with the scenario of deconfined quantum criticality.

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