Transitions from small to large Fermi momenta in a one-dimensional Kondo lattice model

被引:12
|
作者
Pivovarov, E [1 ]
Si, QM [1 ]
机构
[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA
关键词
D O I
10.1103/PhysRevB.69.115104
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study a one-dimensional system that consists of an electron gas coupled to a spin-1/2 chain by Kondo interaction away from half filling. We show that zero-temperature transitions between phases with "small" and "large" Fermi momenta can be continuous. Such a continuous but Fermi-momentum-changing transition arises in the presence of spin anisotropy, from a Luttinger liquid with a small Fermi momentum to a Kondo-dimer phase with a large Fermi momentum. We have also added a frustrating next-nearest-neighbor interaction in the spin chain to show the possibility of a similar Fermi-momentum-changing transition, between the Kondo phase and a spin-Peierls phase, in the spin isotropic case. This transition, however, appears to involve a region in which the two phases coexist.
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页数:11
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