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arXiv 2203.02145cond-mat.str-el
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量子磁体中的二阶磁响应:交流磁场下的磁化

Second-order magnetic responses in quantum magnets: Magnetization under ac magnetic fields

Tatsuya Kaneko, Yuta Murakami, Shintaro Takayoshi, Andrew J. Millis

摘要:

研究了量子磁体在交流磁场作用下的二阶磁响应。我们专注于的情况下,$z$组件的自旋是保守的未扰动的哈密顿量和驱动场施加在$xy$平面。我们发现,线极化驱动场诱导的二次谐波响应,而圆极化场只产生零频率响应,导致磁化方向由螺旋度决定。采用无偏的数值方法,我们证明了在XXZ模型中的圆极化场驱动的非线性磁效应,并表明磁化强度的大小可以预测的动态自旋结构因子在线性响应制度。

英文摘要:

We investigate second-order magnetic responses of quantum magnets against ac magnetic fields. We focus on the case where the $z$ component of the spin is conserved in the unperturbed Hamiltonian and the driving field is applied in the $xy$ plane. We find that linearly polarized driving fields induce a second-harmonic response, while circularly polarized fields generate only a zero-frequency response, leading to a magnetization with a direction determined by the helicity. Employing an unbiased numerical method, we demonstrate the nonlinear magnetic effect driven by the circularly polarized field in the XXZ model and show that the magnitude of the magnetization can be predicted by the dynamical spin structure factor in the linear response regime.

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。

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