论文标题
由刺激的拉曼过渡产生的超速气体中的次波长自旋激发
Sub-wavelength spin excitations in ultracold gases created by stimulated Raman transitions
论文作者
论文摘要
拉曼过渡用于具有超低原子的量子模拟，用于冷却，光谱和人造仪表场的创建。拉曼场的空间形状允许对有效的狂犬病频率进行局部控制，可以将其映射到原子旋转。 Evanescent Raman场是特别的兴趣，因为它们可以从快速衰减的概况中提供新的控制程度，并为其在衍射限制以下产生特征的能力。这为次波长旋转纹理的形成打开了大门。在这项工作中，我们介绍了在逃生驾驶场的存在下对拉曼兔频率的理论和数值研究。我们展示了如何通过在空间变化的驾驶场上创建旋转纹理并展示了Skyrmionium lattice - 一种定期的拓扑自旋激发阵列，每种激发都由两个具有相反拓扑的天空矩阵组成。我们的结果为磁性材料（尤其是巡回旋转模型）中自旋激发动力学的量子模拟铺平了道路。
Raman transitions are used in quantum simulations with ultracold atoms for cooling, spectroscopy and creation of artificial gauge fields. Spatial shaping of the Raman fields allows local control of the effective Rabi frequency, which can be mapped to the atomic spin. Evanescent Raman fields are of special interest as they can provide a new degree of control emanating from their rapidly decaying profile and for their ability to generate features below the diffraction limit. This opens the door to the formation of sub-wavelength spin textures. In this work, we present a theoretical and numerical study of Raman Rabi frequency in the presence of evanescent driving fields. We show how spin textures can be created by spatially varying driving fields and demonstrate a skyrmionium lattice - a periodic array of topological spin excitations, each of which is composed of two skyrmions with opposite topological charges. Our results pave the way to quantum simulation of spin excitation dynamics in magnetic materials, especially of itinerant spin models.
