Dynamic correlations in doped 1D Kondo insulator: Finite-T DMRG study

Details Dynamic correlations in doped 1D Kondo insulator: Finite-T DMRG study Dynamic correlations in doped 1D Kondo insulator: Finite-T DMRG study

1999-07-27

arxiv.org/abs/cond-mat/9907416v1

J. Phys. Soc. Jpn. Vol.68 (1999) 3138

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 Postscript figures, REVTeX

Scientific paper

10.1143/JPSJ.68.3138

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.

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