A finite-frequency functional RG approach to the single impurity Anderson model

Details A finite-frequency functional RG approach to the single impurity Anderson model A finite-frequency functional RG approach to the single impurity Anderson model

2008-06-02

arxiv.org/abs/0806.0246v2

J. Phys.: Condensed Matter 20, 345205 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

accepted by J. Phys.: Condensed Matter

Scientific paper

10.1088/0953-8984/20/34/345205

We use the Matsubara functional renormalization group (FRG) to describe electronic correlations within the single impurity Anderson model. In contrast to standard FRG calculations, we account for the frequency-dependence of the two-particle vertex in order to address finite-energy properties (e.g, spectral functions). By comparing with data obtained from the numerical renormalization group (NRG) framework, the FRG approximation is shown to work well for arbitrary parameters (particularly finite temperatures) provided that the electron-electron interaction U is not too large. We demonstrate that aspects of (large U) Kondo physics which are described well by a simpler frequency-independent truncation scheme are no longer captured by the 'higher-order' frequency-dependent approximation. In contrast, at small to intermediate U the results obtained by the more elaborate scheme agree better with NRG data. We suggest to parametrize the two-particle vertex not by three independent energy variables but by introducing three functions each of a single frequency. This considerably reduces the numerical effort to integrate the FRG flow equations.

Affiliated with

Also associated with

No associations

Rating

A finite-frequency functional RG approach to the single impurity Anderson model 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 A finite-frequency functional RG approach to the single impurity Anderson model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A finite-frequency functional RG approach to the single impurity Anderson model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-631471