Roton偶极矩
Roton dipole moment
摘要：
超流He-4中的旋子激发不具有固定的偶极矩。然而，一个旋子有一个瞬时的偶极矩，使得在任何给定的时刻，人们都可以发现它在其动量方向上具有正或负偶极矩投影的状态。计算了转子激励电偶极矩的瞬时值。这一结果与最近在外电场作用下观察到的共振吸收线分裂现象相符合。
英文摘要：
The roton excitation in the superfluid He-4 does not possess a stationary dipole moment. However, a roton has an instantaneous dipole moment, such that at any given moment one can find it in the state either with positive or with negative dipole moment projection on its momentum direction. The instantaneous value of electric dipole moment of roton excitation is evaluated. The result is in reasonable agreement with recent experimental observation of the splitting of microwave resonance absorption line at roton frequency under external electric field.
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