Kondo spectral functions at low-temperatures : A dynamical-exchange-correlation-field perspective
(2025) In SciPost Physics 18(1).- Abstract
We calculate the low-temperature spectral function of the symmetric single impurity Anderson model using a recently proposed dynamical exchange-correlation (xc) field formalism. The xc field, coupled to the one-particle Green’s function, is obtained through analytic analysis and numerical extrapolation based on finite clusters. In the Kondo regime, the xc field is modeled by an Ansatz that takes into account the different asymptotic behaviors in the small- and large-time regimes. The small-time xc field contributes to the Hubbard side-band, whereas the large-time to the Kondo resonance. We illustrate these features in terms of analytical and numerical calculations for small- and medium-size finite clusters, and in the thermodynamic... (More)
We calculate the low-temperature spectral function of the symmetric single impurity Anderson model using a recently proposed dynamical exchange-correlation (xc) field formalism. The xc field, coupled to the one-particle Green’s function, is obtained through analytic analysis and numerical extrapolation based on finite clusters. In the Kondo regime, the xc field is modeled by an Ansatz that takes into account the different asymptotic behaviors in the small- and large-time regimes. The small-time xc field contributes to the Hubbard side-band, whereas the large-time to the Kondo resonance. We illustrate these features in terms of analytical and numerical calculations for small- and medium-size finite clusters, and in the thermodynamic limit. The results indicate that the xc field formalism provides a good trade-off between accuracy and complexity in solving impurity problems. Consequently, it can significantly reduce the complexity of the many-body problem faced by first-principles approaches to strongly correlated materials.
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- author
- Zhao, Zhen LU
- organization
- publishing date
- 2025-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- SciPost Physics
- volume
- 18
- issue
- 1
- article number
- 002
- publisher
- SciPost
- external identifiers
-
- scopus:85214865321
- ISSN
- 2542-4653
- DOI
- 10.21468/SciPostPhys.18.1.002
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: Copyright Z. Zhao.
- id
- 2adb9f32-10ca-4ae5-a0e8-97af99ca7675
- date added to LUP
- 2025-03-20 13:38:53
- date last changed
- 2025-04-04 14:15:38
@article{2adb9f32-10ca-4ae5-a0e8-97af99ca7675,
abstract = {{<p>We calculate the low-temperature spectral function of the symmetric single impurity Anderson model using a recently proposed dynamical exchange-correlation (xc) field formalism. The xc field, coupled to the one-particle Green’s function, is obtained through analytic analysis and numerical extrapolation based on finite clusters. In the Kondo regime, the xc field is modeled by an Ansatz that takes into account the different asymptotic behaviors in the small- and large-time regimes. The small-time xc field contributes to the Hubbard side-band, whereas the large-time to the Kondo resonance. We illustrate these features in terms of analytical and numerical calculations for small- and medium-size finite clusters, and in the thermodynamic limit. The results indicate that the xc field formalism provides a good trade-off between accuracy and complexity in solving impurity problems. Consequently, it can significantly reduce the complexity of the many-body problem faced by first-principles approaches to strongly correlated materials.</p>}},
author = {{Zhao, Zhen}},
issn = {{2542-4653}},
language = {{eng}},
number = {{1}},
publisher = {{SciPost}},
series = {{SciPost Physics}},
title = {{Kondo spectral functions at low-temperatures : A dynamical-exchange-correlation-field perspective}},
url = {{http://dx.doi.org/10.21468/SciPostPhys.18.1.002}},
doi = {{10.21468/SciPostPhys.18.1.002}},
volume = {{18}},
year = {{2025}},
}