A Schwinger-boson approach to the kagome with Dzyaloshinskii-Moriya interactions: phase diagram and dynamical structure factors - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




A Schwinger-boson approach to the kagome with Dzyaloshinskii-Moriya interactions: phase diagram and dynamical structure factors - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: We have obtained the zero-temperature phase diagram of the kagomeantiferromagnet with Dzyaloshinskii-Moriya interactions in Schwinger-bosonmean-field theory. We find quantum phase transitions first or second orderbetween different topological spin liquids and Neel ordered phases either the$\sqrt{3} \times \sqrt{3}$ state or the so-called Q=0 state. In the regime ofsmall Schwinger-boson density, the results bear some resemblances with exactdiagonalization results and we briefly discuss some issues of the mean-fieldtreatment. We calculate the equal-time structure factor and its angularaverage to allow for a direct comparison with experiments on powder samples,which extends earlier work on the classical kagome to the quantum regime. Wealso discuss the dynamical structure factors of the topological spin liquid andthe Neel ordered phase.



Author: L. Messio, O. Cepas, C. Lhuillier

Source: https://arxiv.org/



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