文档介绍：matter: strongly correlated electronsPiers ColemanFromPhysics WorldDecember1995? IOP Publishing Ltd 2008ISSN: 0953-8585Downloaded on Thu Apr 10 03:59:32 BST 2008 []Institute of Physics PublishingBristol and PhiladelphiaPhysics World Dacember 1995 29featuresOnce physicists thought that the interactions between electronsin a material could be overlooked, but now they know thatsuch interactions are the key to a wealth of new physicsCondensed matter:strongly correlatedelectronsPIERS COLEMANIN A classic understatement, Paul Dirac once remarked tothe Royal Society that "the underlying physical lawsnecessary for the mathematical theory of...physics and thewhole of chemistry are pletely known, and thedifficulty is only that...these laws lead to equations plicated to be soluble".With hindsight, the discoveries of the second part of thiscentury have shown that the task of forging a link betweenthe microscopic world described by quantum mechanicsand the macroscopic world poses unforeseen defies our expectations plexity by revealingconceptually new, yet intrinsically simple, kinds ofmacroscopic behaviour. Phenomena such as high-temperature superconductivity, superfluidity, antiferro-ism, heavy-electron physics and the quantumHall effect are all the unexpected consequences ofcollective behaviour in vast assemblies of interactingp