Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.60: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Slow holes in triangular-lattice antiferromagnets: Spin textures and quasiparticle destruction — •Eugen Wolf1, Eric C. Andrade2, and Matthias Vojta1 — 1Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — 2Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, SP, Brazil
We revisit the problem of a single hole doped into a triangular-lattice antiferromagnet with 120∘ spin order using the t-J model.
Recent work has shown that a static hole induces a non-trivial spin texture due to the release of frustration [1], and we study the fate of this texture upon introducing a finite hopping amplitude.
Our variational results show that the spin texture around a mobile hole is generically given by a superposition of octupolar and dipolar contributions, the latter being responsible for vanishing quasiparticle weight. We determine
the single-hole dispersion and connect our results to those from self-consistent Born approximation. Within this approximation, we discuss various hole-spin correlation functions.
[1] Alexander Wollny, Lars Fritz, and Matthias Vojta, Phys. Rev. Lett. 107, 137204