彩8彩票官网 彩8彩票平台 彩8彩票注册 彩8彩票网 彩8彩票app 彩8彩票注册登录 彩8彩票手机版 彩8彩票网站 彩8彩票网址 彩8彩票登入 彩8彩票开户 彩8彩票主页 彩8彩票官方版 彩8彩票下载

彩8彩票

辦公平台 | 所內郵箱 | ARP | English
當前位置: 首頁 > 科研成果 > 學術活動 > 學術報告
[理论室报告] Non-semiclassical spin dynamics in the triangular lattice quantum antiferromagnet
時間: 2019年04月22日 14:00
地點: M樓830
報告人: Yoshi Kamiya

Shanghai Jiao Tong University

We discuss my recent joint work between theory and experiments on the equilateral triangular-lattice Heisenberg antiferromagnet (TLHAF) Ba3CoSb2O9 with effective S = ½ magnetic moments. The material is an ideal realization of TLHAF with small exchange anisotropy, a fairly good two-dimensionality, and the high-symmetric crystal structure essentially precluding Dzyaloshinskii-Moriya interactions. We focus on the spin dynamics in the 1/3 magnetization plateau phase [1] and also in zero field [2]. We show that nonlinear spin wave theory reproduces the experiments in the plateau phase, thereby allowing us to determine model parameters. However, spin wave theory cannot explain intrinsic features in the spectrum in zero field, such as the magnon-line broadening throughout the Brillouin zone and the high-intensity continuum at high frequencies, even though the ground state is the conventional 120-degree structure. Finally, we also discuss our alternative theoretical approach, the 1/N expansion for the ordered phase, to study the zero-field spin dynamics under the strong influence of quantum fluctuations [3].

References:

[1] J. Ma et al., Phys. Rev. Lett. 116, 087201 (2016)

[2] Y. Kamiya et al., Nature Commun. 9, 2666 (2018)

[3] E. A. Ghioldi et al., Phys. Rev. B 98, 184403 (2018)

聯系人:萬源(82649403)


中科院logo