Properties of shallow-level D −-centers in polar semiconductors

Kashirina, N. I.; Лахно, В. Д.; Сычев, В. В.; Шейнкман, М. К.

doi:10.1134/1.1561522

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…The many-particle interaction energies are obtained for a constant total electron density n t =n s +2n p =0.5 a B w is required in the calculations [73]. This ratio is a material dependent parameter and has been used in the bound-polaron and bound-bipolaron problems [73,74]. Its value is in the range from 0.5 to 2 for different materials [74,75].…”

Section: Polaron Effects In the Two-band System With Single Electronsmentioning

confidence: 99%

“…This ratio is a material dependent parameter and has been used in the bound-polaron and bound-bipolaron problems [73,74]. Its value is in the range from 0.5 to 2 for different materials [74,75]. For the present discussion, we take R y L O w = 1.…”

Section: Polaron Effects In the Two-band System With Single Electronsmentioning

confidence: 99%

“…Because the polaron energy is given by the coupling constant α and the LOphonon energy hω LO , the ratio R y /hω LO is required in the calculations. [73] This ratio is a material dependent parameter and has been used in the bound-polaron and bound-bipolaron problems [73,74]. Its value is in the range from 0.5 to 2 for different materials.…”

Section: Stabilization Of the Electron Pairs And The Ground State Of ...mentioning

confidence: 99%

“…Its value is in the range from 0.5 to 2 for different materials. [74,75] For the present discussion, we take R y /hω LO =1.…”

Section: Stabilization Of the Electron Pairs And The Ground State Of ...mentioning

confidence: 99%

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Electron pairing: from metastable electron pair to bipolaron

et al. 2018

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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 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.

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Section: Polaron Effects In the Two-band System With Single Electronsmentioning

confidence: 99%

Section: Polaron Effects In the Two-band System With Single Electronsmentioning

confidence: 99%

Section: Stabilization Of the Electron Pairs And The Ground State Of ...mentioning

confidence: 99%

“…Its value is in the range from 0.5 to 2 for different materials. [74,75] For the present discussion, we take R y /hω LO =1.…”

Section: Stabilization Of the Electron Pairs And The Ground State Of ...mentioning

confidence: 99%

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Electron pairing: from metastable electron pair to bipolaron

et al. 2018

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“…For the first time, the phonon contribution to the energy of the simplest aggregate centers such as F 2centers and BPs was investigated in the framework of continuum approximation [1][2][3][4]. This direction of the aggregate center theory is currently developed, too [5][6][7][8]. The availbility of the coupled two-electron states such as F 2 -centers and two-center BPs was possible to be explained only due to the account of permutation symmetry in these electron systems.…”

Section: Introductionmentioning

confidence: 99%

Polaron effects in exchange clusters (V2+−F-−V2+ in KMgF3)

Kashirina¹

2005

Semicond. phys. quantum electron. optoelectron.

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We have calculated the phonon contribution to the energy of a superexchange. It is shown that the phonon contribution to the exchange interaction is comparable on the order of magnitude with the Coulomb superexchange. The numerical calculations are performed for a molecular cluster consisting of an exchange-coupled pair V 2+ −F-−V 2+ and 10 nearest ions Fin KMgF 3. The distinctions of a temperature dependence of the exchange interaction caused by phonons are discussed. In systems with the close located electronic levels, the account of interaction with a phonon field reduces in occurrence of resonant terms in the exchange interaction of paramagnetic ions. The similar terms result in occurrence of the exponential temperature dependence in an exchange interaction. As an example, the exchange pair of + 2

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Large-radius bipolaron and the polaron–polaron interaction

Kashirina¹,

Лахно²

2010

Phys.-Usp.

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Properties of shallow-level D −-centers in polar semiconductors

Cited by 4 publications

References 20 publications

Electron pairing: from metastable electron pair to bipolaron

Electron pairing: from metastable electron pair to bipolaron

Polaron effects in exchange clusters (V2+−F-−V2+ in KMgF3)

Large-radius bipolaron and the polaron–polaron interaction

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