Asymmetric conductivity of the Kondo effect in cold atomic systems

Asymmetric conductivity of the Kondo effect in cold atomic systems
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冷原子系统中近藤效应的不对称电导率

DOI:
10.1007/s11467-021-1091-8
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发表时间:
2021-04
影响因子:
7.5
通讯作者:
Ren Zhang
Ren Zhang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yanting Chen;Xin Chen;Ren Zhang

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基于碱土原子量子模拟的最新理论和实验进展,我们提出了在冷原子系统中探测近藤物理的建议。研究表明,在约束诱导共振(CIR)附近,声发射原子中的本征自旋交换相互作用可以显著增强,这有利于近藤物理的模拟。由于近藤效应只出现在反铁磁耦合中,我们发现这种体系的电导率在自旋交换相互作用的共振范围内表现出不对称性。非对称导电性可以作为冷原子背景下近藤物理的确凿证据。当外加磁场增大时,费米面附近的自旋交换过程被Zee-man能量抑制,电导率变得越来越对称。我们的结果可以在当前的实验装置中得到验证。
Motivated by recent theoretical and experimental advances in quantum simulations using alkaline earth (AE) atoms, we put forward a proposal to detect the Kondo physics in a cold atomic system. It has been demonstrated that the intrinsic spin-exchange interaction in AE atoms can be significantly enhanced near a confinement-induced resonance (CIR), which facilitates the simulation of Kondo physics. Since the Kondo effect appears only for antiferromagnetic coupling, we find that the conductivity of such system exhibits an asymmetry across a resonance of spin-exchange interaction. The asymmetric conductivity can serve as the smoking gun evidence for Kondo physics in the cold atom context. When an extra magnetic field ramps up, the spin-exchange process near Fermi surface is suppressed by Zee-man energy and the conductivity becomes more and more symmetric. Our results can be verified in the current experimental setup.
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