Localized Magnetic Moments with Tunable Spin Exchange in a Gas of Ultracold Fermions.
Localized Magnetic Moments with Tunable Spin Exchange in a Gas of Ultracold Fermions.
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DOI：
10.1103/physrevlett.120.143601
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发表时间：
2017-08
影响因子：
8.6
通讯作者：
L. Riegger;N. Oppong;M. Hofer;D. R. Fernandes;I. Bloch;S. Folling
中科院分区：
文献类型：
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作者：
L. Riegger;N. Oppong;M. Hofer;D. R. Fernandes;I. Bloch;S. Folling
报道了一种具有强轨道间自旋交换的双轨道费米子量子气体的依赖态晶格的实验实现。在依赖于态的晶格中，^{173}Yb的基态和亚稳态激发电子态分别起到巡游磁矩和定域磁矩的作用。排斥的现场相互作用结合隧道迁移率导致了移动粒子和定域粒子之间的自旋交换，模拟了著名的近藤哈密顿量中的耦合项。此外，我们还发现，这种交换过程可以通过改变现场限制条件来进行共振调谐。我们将这归因于与一个轨道间散射通道的质心激发束缚态的共振耦合。
We report on the experimental realization of a state-dependent lattice for a two-orbital fermionic quantum gas with strong interorbital spin exchange. In our state-dependent lattice, the ground and metastable excited electronic states of ^{173}Yb take the roles of itinerant and localized magnetic moments, respectively. Repulsive on-site interactions in conjunction with the tunnel mobility lead to spin exchange between mobile and localized particles, modeling the coupling term in the well-known Kondo Hamiltonian. In addition, we find that this exchange process can be tuned resonantly by varying the on-site confinement. We attribute this to a resonant coupling to center-of-mass excited bound states of one interorbital scattering channel.