We investigate the efficiency of the recently proposed Restricted Boltzmann Machine (RBM) representation of quantum many-body states to study both the static properties and quantum spin dynamics in the two-dimensional Heisenberg model on a square lattice. For static properties we find close agreement with numerically exact Quantum Monte Carlo results in the thermodynamical limit. For dynamics and small systems, we find excellent agreement with exact diagonalization, while for systems up to N=256 spins close consistency with interacting spin-wave theory is obtained. In all cases the accuracy converges fast with the number of network parameters, giving access to much bigger systems than feasible before. This suggests great potential to investigate the quantum many-body dynamics of large scale spin systems relevant for the description of magnetic materials strongly out of equilibrium.
Unveiling High-Energy Ultrafast Responses Driven by Fermi-Level Gap Opening in Charge-Density Waves
Chongqing University（重庆大学）；Peking University（北京大学）；Chongqing University of Arts and Sciences（重庆文理学院）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Center for High Pressure Science and Technology Advanced Research（高压科学与技术前沿研究中心）；Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）；Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院镛沙杜利研究所）
$μ$SR Insight into the Impurity Problem in Quantum Kagome Antiferromagnets
杂质，这是固有的存在于任何真实的材料，可能会发挥重要的作用，与自旋液体基态的阻挫自旋系统的磁性。我们通过μ子自旋谱研究ZnCu $_3$（OH）$_6$ SO $_4$（锌-金红石）来解决量子可果美反铁磁体中的杂质问题。我们表明，μ介子耦合到杂质磁性，源自铜锌intersite无序，和杂质是高度相关的kagome自旋，使我们能够通过近藤效应探测内在的kagome物理。局部磁化率的低温平台表明自旋液体基态是无带隙的。相应的自旋涨落表现出非常规的谱密度和有趣的场依赖性。
Exploring Low-Dimensional Magnetism in Cobalt Vanadates, ${A}$CoV$_{2}$O$_{7}$~(${A}$~=~Ca, Sr) : Crystal Growth and Magnetic Properties of Effective Spin-1/2 Zigzag Chains
Investigating structure and physical properties of quaternary layered transition metal oxide Na2Cu2TeO6
UGC-DAE Consortium for Scientific Research, Mumbai Centre, Bhabha Atomic Research Centre（UGC-DAE科学研究中心孟买中心，巴哈原子研究中心）；Savitribai Pule Pune University（萨维特里拜·普勒浦那大学）
Ultrafast Magneto-Pressure Spectroscopy and Control of Correlated Phases in a Trilayer Nickelate
Ames National Laboratory, U.S. Department of Energy（艾姆斯国家实验室）；Department of Physics and Astronomy, Iowa State University（爱荷华州立大学物理与天文学系）；Materials Science Division, Argonne National Laboratory（阿贡国家实验室材料科学部）；School of Physics, Southeast University（东南大学物理学院）；Department of Physics, University of Alabama at Birmingham（阿拉巴马大学伯明翰分校物理系）
Simulation of Quantum Magnetism in Mixed Spin Systems with Impurity Doped Ion Crystal
我们提出实现包含不同原子种类的冷离子线性晶体，用于研究自旋系统中的量子相变和阻挫效应，而不是通常讨论的$s=1/2$的情况。离子之间的相互自旋-自旋相互作用可以通过施加具有强梯度的振荡磁场经由塞曼效应来定制。此外，混合离子晶体中的集体振动模式可用于增强和改变自旋-自旋相互作用的强度，甚至将这些力从铁磁性转变为反铁磁性。研究了自旋S=3的高磁矩离子掺杂自旋为1/2的离子晶体中有效自旋-自旋耦合的行为。我们分析了基态相图，并找到不同的自旋顺序，包括亚铁磁态的区域。在最简单的非平凡例子中，我们处理具有$\{1/2,3,1/2}$自旋的线性$\{$ Ca $^+$，Mn $^+$，Ca $^+\}$晶体。为了展示当前最先进实验的可行性，我们讨论了如何使用离子晶体的集体Stern-Gerlach效应和高分辨率光谱来检测量子相位。在此，指示剂自旋1/2离子（物质$^{40}$ Ca $^+$）的状态相关激光诱导荧光也揭示了模拟自旋3离子（$^{50}$ Mn $^+$）的自旋状态，因为这不具有用于光学激发和检测的合适能级。
