2011/10/03 by Lihua Wang, Wang, Lihua, S. G. Chung +2
Physics and Astronomy · #FOS: Physical sciences #Nonlinear Photonic Systems #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1110.0377
12 pages, 10 figures
openalex publication_date 2011/10/03 · arxiv created 2011/10/04 · arxiv updated 2011/10/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We extend the nonlinear spin wave theory (NLSWT) for the spin 1/2 antiferromagnetic Heisenberg model on a triangular lattice (TAFHM). This novel NLSWT considers the corrections one order higher in 1/S than the linear spin wave theory (LSWT). It also distinguishes in which circumstance the negative energy excitation, the sign of the breakdown of LSWT, shall be renormalized to be positive both by a boson normal ordering and a self-consistent iteration. We draw a phase diagram by testing the stability of various magnetic orders for different parameters. In particular, the incommensurate configuration is found unstable by our study. The new phase transition point (PTP) of the collinear configuration agrees well with various previous studies.