二维Kagomé冰中磁单极子的普适动力学
Universal dynamics of magnetic monopoles in two-dimensional kagomé ice
摘要：
自旋冰中的磁化率是凝聚态物理中一种新的准粒子激发，我们发现Dy $_2$ Ti $_2$ O $_7$的二维自旋冰（所谓的kagomé冰）中交流频率相关的磁化率$χ(ω)$呈现单一标度形式.这种行为可以根据2D库仑气体（CG）系统的动态标度律来理解[Phys.Rev.B90，144428（2014）]，其特征在于电荷相关长度$ξ(\propto1/\sqrt{ω_1})$，其中$ω_{1}$是与$χ(ω)$的虚部的峰位置成比例的特征频率。这是一个普遍的行为之间的各种各样的模型，如二维超导体，二维超流体，经典XY磁体的涡旋动力学，以及动力学的熔化维格纳晶体。
英文摘要：
A magnetic monopole in spin ice is a novel quasiparticle excitation in condensed matter physics, and we found that the ac frequency dependent magnetic susceptibility $χ(ω)$ in the two-dimensional (2D) spin ice (so-called kagomé ice) of Dy$_2$Ti$_2$O$_7$ shows a single scaling form. This behavior can be understood in terms of the dynamical scaling law for 2D Coulomb gas (CG) systems [Phys. Rev. B 90, 144428 (2014)], characterized by the charge correlation length $ξ(\propto1/\sqrt{ω_1})$, where $ω_{1}$ is a characteristic frequency proportional to the peak position of the imaginary part of $χ(ω)$. It is a generic behavior among a wide variety of models such as the vortex dynamics of 2D superconductors, 2D superfluids, classical XY magnets, and dynamics of melting of Wigner crystals.
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