Quasiparticle excitations in frustrated antiferromagnets
arXiv:cond-mat/0410209 · doi:10.1016/j.physb.2004.09.058
Abstract
We have computed the quasiparticle wave function corresponding to a hole injected in a triangular antiferromagnet. We have taken into account multi-magnon contributions within the self consistent Born approximation. We have found qualitative differences, under sign reversal of the integral transfer t, regarding the multi-magnon components and the own existence of the quasiparticle excitations. Such differences are due to the subtle interplay between magnon-assisted and free hopping mechanisms. We conclude that the conventional quasiparticle picture can be broken by geometrical frustration without invoking spin liquid phases.
5 pages, 4 figures, presented at " At the Frontiers of the condensed Matter II, Buenos Aires. June, 2004 ". To be published in Physica B