Kondo effect in alkaline-earth-metal atomic gases with confinement-induced resonances
Kondo effect in alkaline-earth-metal atomic gases with confinement-induced resonances
复制标题
碱土金属原子气体中的近藤效应以及约束引起的共振
DOI：
10.1103/physreva.93.043601
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发表时间：
2016
影响因子：
2.9
通讯作者：
Zhail Hui
中科院分区：
文献类型：
--
作者：
Zhang Ren;Zhang Deping;Cheng Yanting;Chen Wei;Zhang Peng;Zhail Hui
碱土金属原子具有长寿命的电子激发态，并且当处于该激发态的原子通过外部电势定位在基态原子的费米海中时，由于激发态原子和基态原子之间的自旋交换相互作用，它们充当磁性杂质。这可能导致近藤效应。然而，为了在当前的原子气体实验中实现这种效果，需要将近藤温度提高到费米温度的相当大的一部分。本文计算了碱土金属原子基态和激发态之间自旋交换相互作用的约束诱导共振（CIR），并提出利用CIR可以大大增强自旋交换相互作用。我们分析了这个系统的重整化群的方法，并表明，在CIR附近，近藤温度可以显着提高。
Alkaline-earth-metal atoms have a long-lived electronic excited state, and when atoms in this excited state are localized in the Fermi sea of ground-state atoms by an external potential, they serve as magnetic impurities, due to the spin-exchange interaction between the excited- and the ground-state atoms. This can give rise to the Kondo effect. However, in order to achieve this effect in current atomic gas experiments, it requires the Kondo temperature to be increased to a sizable portion of the Fermi temperature. In this paper we calculate the confinement-induced resonance (CIR) for the spin-exchanging interaction between the ground and the excited states of the alkaline-earth-metal atoms and propose that the spin-exchange interaction can be strongly enhanced by utilizing the CIR. We analyze this system by the renormalization-group approach and show that near a CIR, the Kondo temperature can be significantly enhanced.