Controlling collisional loss and scattering lengths of ultracold dipolar molecules with static electric fields
Controlling collisional loss and scattering lengths of ultracold dipolar molecules with static electric fields
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用静电场控制超冷偶极分子的碰撞损失和散射长度
DOI：
10.1103/physrevresearch.6.013145
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发表时间：
2024
影响因子：
4.2
通讯作者：
Mukherjee B
中科院分区：
文献类型：
--
作者：
Mukherjee B
被捕获的超冷分子样品通常寿命很短，因为它们之间的近距离碰撞会导致陷阱损失。我们研究了使用静电场屏蔽来在极性分子之间创建排斥屏障以防止这种损失。屏蔽甚至对于具有相对低的偶极矩的RbCs也非常有效，并且对于具有逐渐变大的偶极子的分子例如NaK、NaRb和NaCs甚至更有效。通过改变电场可以对散射长度进行实质性的控制，这对于分子玻色-爱因斯坦凝聚体的稳定性或崩溃至关重要。这是因为偶极-偶极相互作用产生了一种可随电场调节的长程吸引力。对于RbCs，散射长度在屏蔽有效的范围内是正的，因为负责屏蔽的排斥占主导地位。对于NaK，散射长度可以在零到负值之间调谐。对于NaRb和NaCs，吸引力足够强以支持四原子束缚态，并且散射长度通过这些状态跨越阈值的共振极点。对于KAg和CsAg，存在多个束缚态和多个极点。对于每个分子，我们计算了散射长度随场的变化，并评论了探索新物理的可能性。
Trapped samples of ultracold molecules are often short-lived because close collisions between them result in trap loss. We investigate the use of shielding with static electric fields to create repulsive barriers between polar molecules to prevent such loss. Shielding is very effective even for RbCs, with a relatively low dipole moment, and even more effective for molecules such as NaK, NaRb, and NaCs, with progressively larger dipoles. Varying the electric field allows substantial control over the scattering length, which will be crucial for the stability or collapse of molecular Bose-Einstein condensates. This arises because the dipole-dipole interaction creates a long-range attraction that is tunable with electric field. For RbCs, the scattering length is positive across the range where shielding is effective because the repulsion responsible for shielding dominates. For NaK, the scattering length can be tuned across zero to negative values. For NaRb and NaCs, the attraction is strong enough to support tetra-atomic bound states, and the scattering length passes through resonant poles where these states cross threshold. For KAg and CsAg, there are multiple bound states and multiple poles. For each molecule, we calculate the variation of the scattering length with field and comment on the possibilities for exploring new physics.
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DOI：
10.1088/0953-4075/33/14/312
发表时间：
2000
期刊：
Journal of Physics B
影响因子：
--
作者：
I. Russier;A. Ross;M. Aubert;F. Martin;P. Crozet
通讯作者：
P. Crozet
影响因子：
2.9
作者：
Lepers, M.;Vexiau, R.;Dulieu, O.
通讯作者：
Dulieu, O.
屏蔽超冷 CaF 分子与静电场的碰撞
影响因子：
4.2
作者：
Mukherjee B
通讯作者：
Mukherjee B
影响因子：
4.2
作者：
Frye M
通讯作者：
Frye M
NH自由基的冷碰撞动力学
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
L. Janssen
通讯作者：
L. Janssen