Smooth Self-energy in the Exact-diagonalization-based Dynamical Mean-field Theory : Intermediate-representation Filtering Approach
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説明
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
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 88 (6), 064004-, 2019-06
Tokyo : Physical Society of Japan
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詳細情報 詳細情報について
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- CRID
- 1524232504786073344
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- NII論文ID
- 40021915212
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- NII書誌ID
- AA00704814
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- ISSN
- 00319015
- 13474073
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- NDL書誌ID
- 029726601
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- 本文言語コード
- en
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- NDL 雑誌分類
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- ZM35(科学技術--物理学)
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- データソース種別
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