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Asymmetric conductivity of the Kondo effect in cold atomic systems |
Yanting Cheng1, Xin Chen1, Ren Zhang2( ) |
1. Institute for Advanced Study, Tsinghua University, Beijing 100084, China
2. School of Science, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract 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 Zeeman energy and the conductivity becomes more and more symmetric. Our results can be verified in the current experimental setup.
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| Keywords
Kondo effect
alkaline earth atom
confinement induced resonance
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Corresponding Author(s):
Ren Zhang
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Issue Date: 03 August 2021
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