Electron self-energy from quantum charge fluctuations in the layered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>t</mml:mi><mml:mo>−</mml:mo><mml:mi>J</mml:mi></mml:math> model with long-range Coulomb interaction
書誌事項
- タイトル別名
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- Electron self-energy from quantum charge fluctuations in the layered t-J model with long-range Coulomb interaction
抄録
Employing a large-N scheme of the layered t-J model with the long-range Coulomb interaction, which captures the fine details of the charge excitation spectra recently observed in cuprate superconductors, we explore the role of charge fluctuations on the electron self-energy. We fix the temperature at zero and focus on quantum charge fluctuations. We find a pronounced asymmetry of the imaginary part of the self-energy Im Sigma(k, omega) with respect to omega = 0, which is driven by strong electron correlation effects. The quasiparticle weight is reduced dramatically, which occurs almost isotropically along the Fermi surface. Concomitantly, an incoherent band and a sharp side band are generated and acquire sizable spectral weight. All these features are driven by the usual on-site charge fluctuations, which are realized in a rather high-energy region and yield plasmon excitations. On the other hand, the low-energy region with the scale of the superexchange interaction J is dominated by bond-charge fluctuations. Surprisingly, compared with the effect of on-site charge fluctuations, their effect on the electron self-energy is much weaker, even if the system approaches close to bond-charge instabilities. Furthermore, quantum charge dynamics does not produce a clear kink nor a pseudogap in the electron dispersion.
収録刊行物
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- Physical Review B
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Physical Review B 104 (4), 045141-, 2021-07-26
American Physical Society (APS)
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詳細情報 詳細情報について
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- CRID
- 1050289377902104960
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- NII論文ID
- 120007145348
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- ISSN
- 24699969
- 24699950
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- HANDLE
- 2115/82622
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- 本文言語コード
- en
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- 資料種別
- journal article
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