Reactions between layer-resolved molecules mediated by dipolar spin exchange
Reactions between layer-resolved molecules mediated by dipolar spin exchange
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DOI：
10.1126/science.abn8525
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发表时间：
2021-12
期刊：
影响因子：
56.9
通讯作者：
William G. Tobias;K. Matsuda;Jun-Ru Li;Calder Miller;Annette N. Carroll;T. Bilitewski;A. Rey;Jun Ye
中科院分区：
文献类型：
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作者：
William G. Tobias;K. Matsuda;Jun-Ru Li;Calder Miller;Annette N. Carroll;T. Bilitewski;A. Rey;Jun Ye
对极性分子的可调相互作用的微观控制使得能够实现不同的量子现象。使用电场梯度，我们证明了层分辨状态的制备和成像的超冷钾铷分子局限于二维平面的光学晶格。通过相对于光的偏振方向旋转电场来最大化旋转相干性，以实现状态不敏感捕获。相邻层中空间分离的分子通过旋转角动量的偶极自旋交换相互作用;通过调节这些相互作用，我们调节了局部化学反应速率。交换过程的共振宽度大大超过了偶极相互作用能，这是一种归因于热能的效应。这项工作实现了对相互作用分子的精确控制，使亚波长尺度的电场显微镜成为可能，并允许在二维系统中访问未探索的物理学。描述超冷化学层被困在二维层中的超冷极性分子被预测会表现出复杂的量子现象，这是其他平台无法实现的，因为它们具有长程各向异性和可调偶极相互作用。使用精确的电场控制，Tobias等人展示了限制在光学晶格中的二维平面的超冷钾铷分子的层分辨创建和成像。他们还研究了自旋交换和化学反应，这些反应高度依赖于电场梯度引入的分子温度和层间失谐。这项工作证明了在光学晶格中对超冷分子的高度控制，并且是探索具有降低维度的量子气体系统中新兴现象的有希望的一步。-YS层分辨态制备和成像报道在高度可调的二维层的超冷钾铷分子的光学晶格。
Microscopic control over polar molecules with tunable interactions enables the realization of distinct quantum phenomena. Using an electric field gradient, we demonstrated layer-resolved state preparation and imaging of ultracold potassium-rubidium molecules confined to two-dimensional planes in an optical lattice. The rotational coherence was maximized by rotating the electric field relative to the light polarization for state-insensitive trapping. Spatially separated molecules in adjacent layers interact through dipolar spin exchange of rotational angular momentum; by adjusting these interactions, we regulated the local chemical reaction rate. The resonance width of the exchange process vastly exceeded the dipolar interaction energy, an effect attributed to thermal energy. This work realized precise control of interacting molecules, enabling electric field microscopy on subwavelength scales and allowing access to unexplored physics in two-dimensional systems. Description Layers of ultracold chemistry Ultracold polar molecules trapped in two-dimensional layers are predicted to exhibit complex quantum phenomena not available with other platforms because of long-range anisotropic and tunable dipolar interactions. Using precision electric field control, Tobias et al. demonstrated layer-resolved creation and imaging of ultracold potassium–rubidium molecules confined to two-dimensional planes in an optical lattice. They also studied spin exchange and chemical reactions, which are shown to be highly dependent on the molecule temperature and interlayer detunings introduced by an electric field gradient. This work demonstrates high control of ultracold molecules in an optical lattice and is a promising step toward exploring emerging phenomena in quantum gas systems with reduced dimensionality. —YS Layer-resolved state preparation and imaging is reported in highly tunable two-dimensional layers of ultracold potassium–rubidium molecules in an optical lattice.