= Duncan Haldane
{c}
{tag=Physicist}
{wiki}
= F. Duncan M. Haldane
{c}
{synonym}
= F. D. M. Haldane
{c}
{synonym}
<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.<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]{ref}
A <physicist> researching <condensed matter physics>.<Professional profile of F. Duncan M. Haldane (phy.princeton.edu)>[Independent professional identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Nobel_Laureates_7330_(31372409851).jpg?width=260]
{title=Portrait of <Duncan Haldane>}
{description=Bengt Nyman from Vaxholm, Sweden; 7 December 2016. https://creativecommons.org/licenses/by/2.0/[CC BY 2.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Nobel_Laureates_7330_(31372409851).jpg}
{width=260}
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