Quantum phase transition between one-channel and two-channel Kondo polarons

被引：1
|
作者：
Rincon, Julian [1 ]
Garcia, Daniel J. [2 ,3 ]
Hallberg, K. [2 ,3 ]
Vojta, Matthias [4 ]
机构：
[1] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[2] Comis Nacl Energia Atom, Ctr Atom Bariloche, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[3] Consejo Nacl Invest Cient & Tecn, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[4] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
来源：
PHYSICAL REVIEW B | 2013年 / 88卷 / 14期
关键词：
DENSITY-MATRIX RENORMALIZATION; DIMENSIONAL ELECTRON-GAS; IMPURITY; STATE; METALS; MODEL;
D O I：
10.1103/PhysRevB.88.140407
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
For a mobile spin-1/2 impurity, coupled antiferromagnetically to a one-dimensional gas of fermions, perturbative ideas have been used to argue in favor of two-channel Kondo behavior of the impurity spin. Here we combine general considerations and extensive numerical simulations to show that the problem displays a novel quantum phase transition between two-channel and one-channel Kondo screening upon increasing the Kondo coupling. We construct a ground-state phase diagram and discuss the various nontrivial crossovers as well as possible experimental realizations.
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页数：4
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