Akira Furusaki
Published 2004-09-01, updated 2004-09-22Version 2
Quantum impurity problems in Tomonaga-Luttinger liquids (TLLs) are reviewed with emphasis on their analogy to the Kondo problem in Fermi liquids. First, the problem of a static impurity in a spinless TLL is considered, which is related to the model studied in the context of the macroscopic quantum coherence. In the low-energy limit the TLL is essentially cut into two pieces when interaction is repulsive. The orthogonality catastrophe in a TLL is then discussed. Finally, the Kondo effect of a spin-1/2 impurity in a one-dimensional repulsively interacting electron liquids (a spinful TLL) is reviewed. Regardless of the sign of the exchange coupling, the impury spin is completely screened in the ground state. The leading low-temperature contributions to thermodynamic quantities come from boundary contributions of a bulk leading irrelevant operator.
Comments: 7 pages, submitted to a special edition of JPSJ "Kondo Effect -- 40 Years after the Discovery"; corrected typos, added references
Journal: J. Phys. Soc. Jpn. 74, 73 (2005)
Hamiltonian theory of the strongly-coupled limit of the Kondo problem in the overscreened case
Macroscopic Quantum Coherence in a Magnetic Nanoparticle Above the Surface of a Superconductor
Macroscopic quantum coherence in antiferromagnetic molecular magnets
