Self-Consistent Spin-Wave Analysis of the 1/3 Magnetization Plateau in the Kagome Antiferromagnet
Zhong-Chao Wei1, Hai-Jun Liao1**, Jing Chen1, Hai-Dong Xie1, Zhi-Yuan Liu1, Zhi-Yuan Xie2, Wei Li3,4, B. Normand2, Tao Xiang1,5
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Department of Physics, Renmin University of China, Beijing 100872 3Department of Physics, Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education), Beihang University, Beijing 100191 4International Research Institute of Multidisciplinary Science, Beihang University, Beijing 100191 5Collaborative Innovation Center of Quantum Matter, Beijing 100190
Abstract：We propose a modified spin-wave theory to study the 1/3 magnetization plateau of the antiferromagnetic Heisenberg model on the kagome lattice. By the self-consistent inclusion of quantum corrections, the 1/3 plateau is stabilized over a broad range of magnetic fields for all spin quantum numbers $S$. The values of the critical magnetic fields and the widths of the magnetization plateaus are fully consistent with the recent numerical results from exact diagonalization and infinite projected entangled paired states.
2016, Vol. 33 
