Kondo polarons in a one-dimensional Fermi gas

Abstract

We consider the motion of a spin-1/2 impurity in a one-dimensional gas of spin-1/2 fermions. For antiferromagnetic interaction between the impurity and the fermions, the low temperature behavior of the system is governed by the two-channel Kondo effect, leading to the impurity becoming completely opaque to the spin excitations of the gas. As well as the known spectral signatures of the two-channel Kondo effect, we find that the low temperature mobility of the resulting `Kondo polaron' takes the universal form $\mu \to \frac{3\hslash v_F^2}{2\pi k_B^2{T}^2}$, in sharp contrast to the spinless case where $\mu \propto T^{-4}$.

Published version

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• New theoretical approaches to Bose polarons
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• Mobile magnetic impurities in a Fermi superfluid: a route to designer molecules
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• Scattering of charge and spin excitations and equilibration of a one-dimensional Wigner crystal
• Cavity-enhanced Kondo effect
• Kinetic processes in Fermi-Luttinger liquids
• Quantum phase transition between one-channel and two-channel Kondo polarons
• Brownian scattering of a spinon in a Luttinger liquid