发表机构
Mahindra University; Uppsala University; Indian Institute of Technology Roorkee; Tata Institute of Fundamental Research; BITS Pilani-Hyderabad Campus（马欣德拉大学; 乌普萨拉大学; 鲁尔基印度理工学院; 塔塔基础研究所; 比蒂斯皮拉尼海得拉巴校区）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过第一性原理和自旋动力学模拟，发现准二维kagome磁体YMn$_6$Sn$_6$中面内DMI与铁磁交换稳定了无序斯格明子相，在-0.5至0.5 T范围内出现拓扑霍尔平台，由均匀标量自旋手性和实空间贝里曲率驱动，平台大小和符号受Hund耦合与化学势影响。
AI 中文摘要
我们研究了Dzyaloshinskii-Moriya相互作用（DMI）在kagome磁体中的影响，并表明主要的面内DMI与铁磁交换作用共同稳定了准二维YMn$_6$Sn$_6$中的无序斯格明子相。在结合密度泛函理论和自旋动力学模拟的第一性原理框架内，我们生成了无序斯格明子的真实自旋纹理，并发现该相在$B_{ext} < 0.5$ T时持续存在，斯格明子尺寸随磁场增加而减小。我们证明了在$-0.5 \leq B_{ext} < 0.5$ T范围内拓扑霍尔平台的出现，这是由近乎均匀的标量自旋手性和由此产生的恒定实空间贝里曲率驱动的。该响应与磁场反对称，而平台的大小和符号由Hund耦合强度与化学势之间的复杂相互作用决定，表明狄拉克点和范霍夫奇点的重要作用。此外，我们揭示了准二维YMn$_6$Sn$_6$无序斯格明子相中的拓扑磁振子激发。
英文摘要
We examine the impact of the Dzyaloshinskii--Moriya interaction (DMI) in kagome magnets and show that a predominantly planar DMI together with ferromagnetic exchange stabilizes a disordered skyrmion phase in quasi-two-dimensional (2D) YMn$_6$Sn$_6$. Within an {\it{ab initio}} framework combining density functional theory and spin-dynamics simulations, we generate realistic spin textures of disordered skyrmion and find that this phase persists for $B_{\rm ext} \leq 0.5$~T, with a decreasing skyrmion size as magnetic field increases. We demonstrate the emergence of topological Hall plateau in the range $-0.5 \leq B_{\mathrm{ext}} \leq 0.5$~T, driven by nearly uniform scalar spin chirality and the resulting constant real-space Berry curvature. This response is anti-symmetric with magnetic field while magnitude and sign of these plateau are determined by a complex interplay between Hund's coupling strength and chemical potential signifying the role of Dirac points and van Hove singularities. In addition, we reveal topological magnon excitations in the disordered skyrmion phase of quasi-2D YMn$_6$Sn$_6$.
