Strings in strongly correlated electron systems

It is shown that strongly correlated electrons on frustrated lattices like pyrochlore, checkerboard or kagome lattice can lead to the appearance of closed and open strings. They are resulting from nonlocal subsidiary conditions which propagating strongly correlated electrons require. The dynamics of the strings is discussed and a number of their properties are pointed out, Some of them are reminiscent of particle physics. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.