Influence of the Kondo effect in a non-Fermi liquid system
Abstract
The Kondo effect in a Tomonaga-Luttinger liquid (
U<<t
) is studied by using the non-Abelian bosonization. The
q=2
k
F
enhanced spin fluctuations generate a special Kondo effect, for any sign of the exchange coupling
J
K
(
|
J
K
|<<U
) with the impurity. Then, unlike in Fermi liquids (
U→0
), the presence of a
2
k
F
-polarized screening cloud around the impurity favors the occurrence of irrelevant electronic operators with scaling dimension
d=3/2
: the thermodynamics is nearly this of the two-channel Kondo model in a Fermi liquid. The Mott insulating transition does not affect much the ground state, but rescales the power-law dependence of the Kondo temperature on
J
K
.