Smooth Self-energy in the Exact-diagonalization-based Dynamical Mean-field Theory : Intermediate-representation Filtering Approach
Search this article
Description
We propose a method for estimating smooth real-frequency self-energy in the dynamical mean-field theory with the finite-temperature exact diagonalization (DMFT-ED). One of the benefits of DMFT-ED calculations is that one can obtain real-frequency spectra without a numerical analytic continuation. However, these spectra are spiky and strongly depend on the way to discretize a continuous bath (e.g., the number of the bath sites). The present scheme is based on a recently proposed compact representation of imaginary-time Green's functions, the intermediate representation (IR). The projection onto the IR basis acts as a noise filter for the discretization errors in the self-energy. This enables to extract the physically relevant part from the noisy self-energy. We demonstrate the method for single-site DMFT calculations of the single-band Hubbard model. We also show the results can be further improved by numerical analytic continuation.
6 pages, 5 figures. The main text and figures are revised
Journal
-
- Journal of the Physical Society of Japan
-
Journal of the Physical Society of Japan 88 (6), 064004-, 2019-06
Tokyo : Physical Society of Japan
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1524232504786073344
-
- NII Article ID
- 40021915212
-
- NII Book ID
- AA00704814
-
- ISSN
- 00319015
- 13474073
-
- NDL BIB ID
- 029726601
-
- Text Lang
- en
-
- NDL Source Classification
-
- ZM35(科学技術--物理学)
-
- Data Source
-
- NDL Search
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE