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Nature Physics 5, 784–785 (1 November 2009) | doi:10.1038/nphys1439

Topological phases: Wormholes in quantum matter

Kareljan Schoutens

There is no end to the list of remarkable quantum phases of matter that can emerge if simple building blocks are endowed with just the right interactions and are cooled to low enough temperatures. In many cases, the essence of such phases can be captured by an order parameter.