Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-07-03
Phys. Rev. Lett. 81, p.1690 (1998).
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages in revtex format including 3 embedded figures (using epsf). The latest version in PDF format is available from http:
Scientific paper
10.1103/PhysRevLett.81.1690
We consider a magnetic impurity in the antiferromagnetic spin-1/2 chain which is equivalent to the two-channel Kondo problem in terms of the field theoretical description. Using a modification of the transfer-matrix density matrix renormalization group (DMRG) we are able to determine local and global properties in the thermodynamic limit. The cross-over function for the impurity susceptibility is calculated over a large temperature range, which exhibits universal data-collapse. We are also able to determine the local susceptibilities near the impurity, which show an interesting competition of boundary effects. This results in quantitative predictions for experiments on doped spin-1/2 chains, which could observe two-channel Kondo physics directly.
Eggert Sebastian
Rommer Stefan
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