Spectral properties of the one-dimensional two-channel Kondo lattice model

We have studied the energy spectrum of a one-dimensional Kondo lattice. whe re the localized magnetic moments have SUM symmetry and two channels of con duction electrons are present. At half filling. the system is shown to exis t in two phases: one dominated by RKKY-exchange interaction effects, and th e other by Kondo screening. A quantum phase transition point separates thes e two regimes at temperature T = 0. The Kondo-dominated phase is shown to p ossess soft modes, with spectral gaps much smaller than the Kondo temperatu re. (C) 2001 Elsevier Science B.V. All rights reserved.