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Title
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Electron pairing : from metastable electron pair to bipolaron
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Author
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Abstract
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| Starting from the shell structure in atoms and the significant correlation within electron pairs, we distinguish the exchange-correlation effects between two electrons of opposite spins occupying the same orbital from the average correlation among many electrons in a crystal. In the periodic potential of the crystal with lattice constant larger than the effective Bohr radius of the valence electrons, these correlated electron pairs can form a metastable energy band above the corresponding single-electron band separated by an energy gap. In order to determine if these metastable electron pairs can be stabilized, we calculate the many-electron exchange-correlation renormalization and the polaron correction to the two-band system with single electrons and electron pairs. We find that the electron-phonon interaction is essential to counterbalance the Coulomb repulsion and to stabilize the electron pairs. The interplay of the electron-electron and electron-phonon interactions, manifested in the exchange-correlation energies, polaron effects, and screening, is responsible for the formation of electron pairs (bipolarons) that are located on the Fermi surface of the single-electron band. |
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Language
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English
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Source (journal)
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Journal of physics communications. - Bristol, 2017, currens
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Publication
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Bristol
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IOP Publishing
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2018
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ISSN
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2399-6528
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DOI
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10.1088/2399-6528/AAAEE0
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Volume/pages
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2
:3
(2018)
, 20 p.
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Article Reference
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UNSP 035017
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ISI
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000434996900022
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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