Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-09-12
Physics
Condensed Matter
Strongly Correlated Electrons
23pages 19 Figures
Scientific paper
We calculate the spin and charge dynamical susceptibilities of a strongly correlated impurity model in a renormalised perturbation theory. The irreducible for vertices for the quasiparticle scattering are deduced from the renormalised parameters, which have been calculated by fitting of the low-lying levels of a numerical renormalisation group (NRG) calculation to those of an effective Anderson model. The susceptibilities are asymptotically exact in the low frequency limit and satisfy the Korringa-Shiba relation. By comparing the results with those calculated from a direct NRG calculation, we show that the renormalised perturbation theory (RPT) description gives a very good description of spin dynamics for all values of the local interaction U, not only at low frequencies but over the whole relevant frequency range. In the presence of a magnetic field the approach can be generalised using field dependent renormalised parameters to calculate the transverse and parallel spin dynamic susceptibilities. The RPT results give accurate results for the spin dynamics over the whole frequency range and for all values of the magnetic field.
No associations
LandOfFree
Spin and Charge Dynamics in a Renormalised Perturbation Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin and Charge Dynamics in a Renormalised Perturbation Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin and Charge Dynamics in a Renormalised Perturbation Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-2408