Eur. Phys. J. B 5, 351-359 (1998)
https://doi.org/10.1007/s100510050453

Elementary excitations for the Anderson model at finite temperatures^*

¹ Department of Applied Physics, Osaka University, Suita, Osaka 565, Japan
² Wakayama National College of Technology, Gobo, Wakayama 644, Japan

Corresponding author: ^a suga@dyn.ap.eng.osaka-u.ac.jp

Received: 21 January 1998
Accepted: 17 March 1998
Published online: 15 October 1998

Abstract

The elementary excitation spectrums for the Anderson model at finite temperatures are calculated by using the Bethe-ansatz solution. The formulation is based on the method of Yang and Yang, which was developed for the one-dimensional boson systems with the δ-function type interaction. We obtain the temperature dependence of the spin and the charge excitation spectrums. When the impurity level lies deeply from the Fermi level and the Coulomb interaction is suitably large, the resonant peak structure develops in the low energy region of the spin excitation spectrum and the hump structure grows around the impurity level of the charge excitation spectrum with decreasing temperature.