= Andre Geim
{c}
{tag=Physicist}
{wiki}
= A. K. Geim
{c}
{synonym}
<Andre Geim> coauthored measurements showing that <electric charge> carriers in <graphene> can behave as effectively massless <quasiparticles> described by the <Dirac equation>. The 2005 experiments found an unusual sequence of <quantum Hall effect> plateaus and an oscillation phase associated with <Berry phase>. Here the Dirac description concerns low-energy <quasiparticles> in a <carbon> lattice, rather than free <electrons> acquiring zero rest mass. The results connect a readily contacted material with concepts usually introduced in relativistic <quantum mechanics>.<Two-Dimensional Gas of Massless Dirac Fermions in Graphene by Konstantin Novoselov and others>[Nature 438, 197 (2005), abstract and transport observations]{ref}
A <physicist> researching <condensed matter physics>, including <graphene>.<Sir Andre Geim FRS by Royal Society>[Independent professional identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Andre%20Geim%2010.jpg?width=250]
{title=Portrait of <Andre Geim>}
{description=Bengt Oberger, own photograph, 9 December 2018. https://creativecommons.org/licenses/by-sa/4.0/[Creative Commons Attribution-Share Alike 4.0 International.], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Andre_Geim_10.jpg}
{width=250}
Back to article page
