Duncan Haldane constructed a two-dimensional lattice model with quantized Hall conductivity without a net applied magnetic field. The Haldane model separates the topological mechanism of the quantum Hall effect from the usual formation of Landau levels in a uniform field. Changing model parameters closes and reopens an energy gap, separating phases with different Hall responses. This provides a compact theoretical example in which the global structure of occupied electronic states determines a measurable transport coefficient.[ref]
Model for a Quantum Hall Effect without Landau Levels: Condensed-Matter Realization of the Parity Anomaly by F. Duncan M. Haldane. Physical Review Letters 61, 2015 (1988), lattice model and quantized Hall response
A physicist researching condensed matter physics.[ref]
Professional profile of F. Duncan M. Haldane (phy.princeton.edu). Independent professional identity
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Portrait of Duncan Haldane
. Bengt Nyman from Vaxholm, Sweden; 7 December 2016. CC BY 2.0, via Wikimedia Commons. Source.
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Duncan Haldane is a British physicist renowned for his contributions to condensed matter physics, particularly in the fields of quantum liquids, topological phases of matter, and theoretical condensed matter systems. He is one of the leading figures in the study of topological insulators and has made significant contributions to our understanding of quantum field theory in condensed matter physics. Haldane was awarded the Nobel Prize in Physics in 2016, along with David J. Thouless and F. Duncan M.
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