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Theory of the valley-density wave and hidden order in iron pnictides
Physical Review B
In the limit of perfect nesting, the physics of iron-pnictides is governed by the density wave formation at the zone-edge vector M. At high energies, various spin- (SDW), charge- (CDW), orbital/pocket- (PDW) density waves, and their linear combinations, all appear equally likely, unified within the unitary order parameter of U(4)XU(4) symmetry. Nesting imperfections and low-energy interactions reduce this symmetry to that of real materials. Nevertheless, the generic ground state preserves adoi:10.1103/physrevb.83.020505 fatcat:dwstutqq3zhvzpuxshfstrmsiy