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

作者：Shibata N^*; Tsunetsugu H

来源：Journal of the Physical Society of Japan, 1999, 68(10): 3138-3141.

DOI：10.1143/JPSJ.68.3138

• Kondo lattice
• density of states
• dynamic correlation functions
• density matrix
• renormalization group
• transfer matrix
• Kondo insulator
• Tomonaga-Luttinger liquid
• heavy fermion

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-e(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 he evidence of the formation of collective excitations, and this confirms that the metallic phase is a Tomonaga-Luttinger liquid in the low-temperature limit.

• 出版日期1999-10