Dynamic correlations in doped 1D Kondo insulator: Finite-T DMRG study
摘要
The finite-T DMRG method is applied to the one-dimensional Kondo lattice model to calculate dynamic correlation functions. Dynamic spin and charge correlations, S_f(omega), S_c(omega), and N_c(omega), and quasiparticle density of states rho(omega) are calculated in the paramagnetic metallic phase for various temperatures and hole densities. Near half filling, it is shown that a pseudogap grows in these dynamic correlation functions below the crossover temperature characterized by the spin gap at half filling. A sharp peak at omega=0 evolves at low temperatures in S_f(omega) and N_c(omega). This may be an evidence of the formation of the collective excitations, and this confirms that the metallic phase is a Tomonaga-Luttinger liquid in the low temperature limit.
引用
@article{arxiv.cond-mat/9907416,
title = {Dynamic correlations in doped 1D Kondo insulator: Finite-T DMRG study},
author = {N. Shibata and H. Tsunetsugu},
journal= {arXiv preprint arXiv:cond-mat/9907416},
year = {2009}
}
备注
5 pages, 6 Postscript figures, REVTeX