Kondo polarons in a one-dimensional Fermi gas

Details Kondo polarons in a one-dimensional Fermi gas Kondo polarons in a one-dimensional Fermi gas

2008-05-02

arxiv.org/abs/0805.0235v2

Phys. Rev. Lett. 101, 225301 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Published version

Scientific paper

10.1103/PhysRevLett.101.225301

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 $\mu\to \frac{3\hbar v_F^2}{2\pi k_B^2T^2}$, in sharp contrast to the spinless case where $\mu\propto T^{-4}$.

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