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TT: Fachverband Tiefe Temperaturen

TT 36: Focus Session: Advanced Algorithms for Strongly Correlated Quantum Matter

TT 36.2: Hauptvortrag

Dienstag, 1. April 2014, 10:00–10:30, HSZ 03

Quantum Monte Carlo Simulations of Deconfined Quantum-Criticality — •Anders Sandvik — Boston University, USA

I will discuss recent results, based on quantum Monte Carlo (QMC) simulations, for the quantum phase transition from the standard Neel state of a 2D antiferromagnet into a non-magnetic valence-bond solid state. The transition has been achieved in two different classes of models which are amenable to large-scale QMC simulations. These models can be defined with SU(N) spins for several different values of N, and results for these models can be compared with 1/N expansions of the quantum field-theory proposed to describe the "deconfined" transition. I will also discuss results for thermodynamics, which indicate that deconfined spinons can describe the excitation spectrum at criticality.