arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.01243cond-mat.str-el
收藏

Dzyaloshinskiii-Moriya相互作用诱导的Kagome反铁磁体上的手征自旋液体

Chiral spin liquid on kagome antiferromagnet induced by Dzyaloshinskii-Moriya interaction

Laura Messio, Samuel Bieri, Claire Lhuillier, Bernard Bernu

摘要:

采用反铁磁Heisenberg模型描述了量子自旋液体Herbertsmithite,该模型是在具有不可忽略的Dzyaloshinskii-Moriya相互作用的kagome晶格上建立的.一个完善的相变$\mathbf q=0$长程序发生在这个模型中时,的α-强度增加,但一个小α-相的精确性质仍然存在争议。在这里,我们描述了从Schwinger-boson平均场论获得的新相位,其在小振幅下是稳定的,并且其可以解释在Han等人的非弹性中子散射实验中看到的无色散谱(Nature(London)492,406(2012)})。它是一种时间反转对称性破缺的$\mathbb Z_2$自旋液体,具有布里渊区扩展区域中小而恒定的自旋间隙的独特性质。给出了相图随自旋和自旋尺寸的变化关系,并给出了动态自旋结构因子。

英文摘要:

The quantum spin liquid material herbertsmithite is described by an antiferromagnetic Heisenberg model on the kagome lattice with non-negligible Dzyaloshinskii-Moriya interaction~(DMI). A well established phase transition to the $\mathbf q=0$ long-range order occurs in this model when the DMI strength increases, but the precise nature of a small-DMI phase remains controversial. Here, we describe a new phase obtained from Schwinger-boson mean-field theory that is stable at small DMI, and which can explain the dispersionless spectrum seen in inelastic neutron scattering experiment by Han et al (Nature (London) 492, 406 (2012)}). It is a time-reversal symmetry breaking $\mathbb Z_2$ spin liquid, with the unique property of a small and constant spin gap in an extended region of the Brillouin zone. The phase diagram as a function of DMI and spin size is given, and dynamical spin structure factors are presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑