2009/12/14 by L. Messio, Laura Messio, O. Cepas +2 · 3 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Boson #Condensed matter physics #Field (mathematics) #Mathematical physics #Order (exchange) #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Spin (aerodynamics) #Structure factor #Topological Materials and Phenomena #Work (physics) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.81.064428
published as Phys. Rev. B 81, 064428 (2010) · 8 pages, 9 figures
arxiv created 2009/12/14 · openalex publication_date 2010/02/24 · arxiv updated 2011/01/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We have obtained the zero-temperature phase diagram of the kagom'e antiferromagnet with Dzyaloshinskii-Moriya interactions in Schwinger-boson mean-field theory. We find quantum phase transitions (first or second order) between different topological spin-liquid and N'eel-ordered phases (either the √(3)\ifmmode×\else\texttimes\fi√(3) state or the so-called Q=0 state). In the regime of small Schwinger-boson density, the results bear some resemblances with exact diagonalization results and we briefly discuss some issues of the mean-field treatment. We calculate the equal-time structure factor (and its angular average to allow for a direct comparison with experiments on powder samples), which extends earlier work on the classical kagom'e to the quantum regime. We also discuss the dynamical structure factors of the topological spin-liquid and the N'eel-ordered phases.