超流体中强取向极性分子的振动
Libration of strongly-oriented polar molecules inside a superfluid
摘要：
我们研究了在强静电场存在下，浸入超流环境中的极性分子，如氦纳米滴或玻色-爱因斯坦凝聚体。我们表明，耦合的分子摆动运动，诱导的字段，到波动浴导致形成的drons-球谐图书馆穿着由多粒子激发场。我们研究了在很宽的分子浴和分子场相互作用强度范围内的角动量的行为，并揭示了它的光谱特征的一系列不稳定性，这是缺席的无场的情况下的角动量准粒子。此外，我们表明，外场允许微调这些不稳定性的分子旋转光谱的位置。这为详细研究多粒子系统中轨道角动量的再分配打开了大门。
英文摘要：
We study a polar molecule immersed into a superfluid environment, such as a helium nanodroplet or a Bose-Einstein condensate, in the presence of an intense electrostatic field. We show that coupling of the molecular pendular motion, induced by the field, to the fluctuating bath leads to formation of pendulons -- spherical harmonic librators dressed by a field of many-particle excitations. We study the behavior of the pendulon in a broad range of molecule-bath and molecule-field interaction strengths, and reveal that its spectrum features series of instabilities which are absent in the field-free case of the angulon quasiparticle. Furthermore, we show that an external field allows to finetune the positions of these instabilities in the molecular rotational spectrum. This opens the door to detailed experimental studies of redistribution of orbital angular momentum in many-particle systems.
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