Electron pairing: from metastable electron pair to bipolaron
Nenhuma Miniatura disponível
Data
2018
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
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.Wefind that the electronphonon
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.
Descrição
Palavras-chave
Electronic structure, Energy band, Electron pairing, Polaron effects, Electron correlation
Citação
G-Q. Hai; CÂNDIDO, L.; BRITO, B. G. A; PEETERS, F. M. Electron pairing: from metastable electron pair to bipolaron. Journal of Physics Communications, Bristol, v. 2, e035017, 2018. DOI: 10.1088/2399-6528/aaaee0. Disponível em: https://iopscience.iop.org/article/10.1088/2399-6528/aaaee0. Acesso em : 27 abr. 2023.