Stability of Holstein and Frohlich bipolarons
SCIE
SCOPUS
- Title
- Stability of Holstein and Frohlich bipolarons
- Authors
- Chakraborty, M; Min, BI; Chakrabarti, A; Das, AN
- Date Issued
- 2012-06-21
- Publisher
- APS
- Abstract
- We have investigated bipolaron formation in the Holstein-Hubbard and the Frohlich-Hubbard model on a discrete one-dimensional lattice. Phonon enriched basis has been generated by exploiting the idea of the Lang-Firsov transformation, which results in better convergence in the strong coupling regime. The incorporation of the finite-range electron-phonon (e-ph) interaction reduces the bipolaron effective mass. We systematically increase the spatial extent of the e-ph interaction to study the effect of the long-range tail of the Frohlich model. The electron-electron (e-e) interaction also plays a crucial role in lowering the effective mass for both the Holstein and the Frohlich bipolarons. In the presence of the extended e-e interaction, the intersite S1 Holstein bipolaron becomes unstable, while the effective mass of the Frohlich bipolaron becomes significantly reduced for both the spin singlet and triplet cases.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12275
- DOI
- 10.1103/PHYSREVB.85.245127
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 85, no. 24, page. 245127, 2012-06-21
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