Association of atoms into universal dimers using an oscillating magnetic field.
Association of atoms into universal dimers using an oscillating magnetic field.
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使用振荡磁场将原子缔合为通用二聚体。
DOI：
10.1103/physrevlett.114.103002
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发表时间：
2014
影响因子：
8.6
通讯作者：
E. Braaten
中科院分区：
文献类型：
--
作者：
Christian Langmack;D. H. Smith;E. Braaten
在Feshbach共振附近的超冷原子系统中，原子对可以通过振荡磁场结合成通用的二聚体，其频率接近由二聚体结合能确定的频率。我们提出了一个简单的表达的过渡率，考虑到多体效应，通过过渡矩阵元素的接触。在热气体中，作为频率函数的跃迁速率的峰宽由温度决定。在原子的稀玻色-爱因斯坦凝聚体中，宽度由二聚体与零能量原子的非弹性散射率决定。在原子-二聚体共振附近，非弹性原子-二聚体散射和原子-原子-二聚体复合会使宽度急剧增加。复合的贡献提供了一个通用的四聚体的Efimov状态组成的两个原子和二聚体的签名。
In a system of ultracold atoms near a Feshbach resonance, pairs of atoms can be associated into universal dimers by an oscillating magnetic field with a frequency near that determined by the dimer binding energy. We present a simple expression for the transition rate that takes into account many-body effects through a transition matrix element of the contact. In a thermal gas, the width of the peak in the transition rate as a function of the frequency is determined by the temperature. In a dilute Bose-Einstein condensate of atoms, the width is determined by the inelastic scattering rates of a dimer with zero-energy atoms. Near an atom-dimer resonance, there is a dramatic increase in the width from inelastic atom-dimer scattering and from atom-atom-dimer recombination. The recombination contribution provides a signature for universal tetramers that are Efimov states consisting of two atoms and a dimer.