具有Dzyaloshinskiii-Moriya相互作用的量子磁体中磁化平台处的转矩反常
Torque anomalies at magnetization plateaux in quantum magnets with Dzyaloshinskii-Moriya interactions
摘要：
我们研究了Dzyaloshinskiii-Moriya（DM）相互作用对具有磁化平台的量子磁体的扭矩测量的影响。使用广泛的DMRG模拟，我们表明，DM贡献的扭矩达到峰值的临界字段，和总扭矩是非单调的，如果DM相互作用是足够大的g-张量各向异性相比。更值得注意的是，如果DM矢量指向g张量的主方向，则即使对于小DM相互作用，接近该方向的扭矩测量也将显示出明确的峰值，从而导致非常灵敏的检测临界场的方法。我们建议在二维平台系统SrCu $_2$（BO $_3$）$_2$中测试这种效应。
英文摘要：
We investigate the effect of Dzyaloshinskii-Moriya (DM) interactions on torque measurements of quantum magnets with magnetization plateaux in the context of a frustrated spin-1/2 ladder. Using extensive DMRG simulations, we show that the DM contribution to the torque is peaked at the critical fields, and that the total torque is non-monotonous if the DM interaction is large enough compared to the g-tensor anisotropy. More remarkably, if the DM vectors point in a principal direction of the g-tensor, torque measurements close to this direction will show well defined peaks even for small DM interaction, leading to a very sensitive way to detect the critical fields. We propose to test this effect in the two-dimensional plateau system SrCu$_2$(BO$_3$)$_2$.
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