Quasiparticle excitations in frustrated antiferromagnets

Details Quasiparticle excitations in frustrated antiferromagnets Quasiparticle excitations in frustrated antiferromagnets

2004-10-08

arxiv.org/abs/cond-mat/0410209v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, presented at " At the Frontiers of the condensed Matter II, Buenos Aires. June, 2004 ". To be published in

Scientific paper

10.1016/j.physb.2004.09.058

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.

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