Bipolarons in anisotropic crystals and low dimensional structures

Bipolaron energy is calculated for various distances between the centers of polarization wells of two polarons with accounting the electron correlations. A singlet bipolaron is stable at a rather high energy of ion binding h h m % 0:143, h ¼ e 1 =e 0 (e 1 and e 0 are the high-frequency and static dielectric constants, respectively). The unique energy minimum corresponds to a one-center bipolaron (analog of a helium atom). The bipolaron binding energy constitutes up to 25.8 % of a double polaron energy at h ! 0. A triplet bipolaron (analog of ortho-helium) is energetically disadvantageous. The one-center configuration of a triplet bipolaron corresponds to a maximum on the distance dependence of the total energy J Bp ðRÞ. The exchange interaction between polarons has antiferromagnetic character. A prediction is made about a possibility of Wigner crystallization of a polaron gas, which occurs with antiferromagnetic ordering in the polaron system.

show abstract

Electron Correlations and Spatial Configuration of the Bipolaron

Kashirina

Лахно

Sychyov

2002

phys. stat. sol. (b)

View full text Add to dashboard Cite

show abstract

Electron correlations and instability of a two-center bipolaron

2003

View full text Add to dashboard Cite

Investigation of electron correlation effect on energy spectrum of two-electron systems in crystals with strong electron-phonon coupling

Kashirina¹

2002

Semicond. Phys. Quantum Electron. Optoelectron.

View full text Add to dashboard Cite

The influence of electron correlations (direct dependence of electronic wave function on distance between electrons) on energy spectra of two-electron systems (D , F ′, F 2-centers and bipolarons) in polar crystals with strong electron-phonon interaction is investigated. Bipolaron is chosen as the simplest model of two-electron system in the crystal. Bipolaron energy is calculated for various distances between the centers of polarization wells of two polarons with accounting the electron correlations. A singlet bipolaron is stable at rather high energy of ion binding η ≤η m ≈ 0,143 (0 /ε ε η ∞ =). The unique energy minimum corresponds to a one-center bipolaron (an analog of a helium atom). The bipolaron binding energy constitutes up to 25.8% of a double polaron energy at η → 0. A triplet bipolaron (an analog of orthohelium) is energetically disadvantageous. The one-center configuration of a triplet bipolaron corresponds to a maximum on the distance dependence of the total energy J Bp (R). The exchange interaction between polarons has antiferromagnetic character. A prediction is made about a possibility of the Wigner crystallization of a polaron gas, which occurs with antiferromagnetic ordering in the polaron system. The examples of energy calculations with accounting the electron correlations of exchanged-coupled pairs, D and F ′-centers in polar crystals are also given.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Bipolarons in anisotropic crystals and low dimensional structures

Cited by 5 publications

References 9 publications

Electron Correlations and Spatial Configuration of the Bipolaron

Electron Correlations and Spatial Configuration of the Bipolaron

Electron correlations and instability of a two-center bipolaron

Investigation of electron correlation effect on energy spectrum of two-electron systems in crystals with strong electron-phonon coupling

Contact Info

Product

Resources

About