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Light and stable triplet bipolarons on square and triangular lattices

Hague, J. P. and Kornilovitch, P. E. (2010). Light and stable triplet bipolarons on square and triangular lattices. Physical Review B, 82(9) 094301.

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We compute the properties of singlet and triplet bipolarons on two-dimensional lattices using the continuous-time quantum Monte Carlo algorithm. Properties of the bipolaron including the total energy, inverse mass, bipolaron radius, and number of phonons associated with the bipolaron demonstrate the qualitative difference between models of electron-phonon interaction with long-range interaction (screened Fröhlich) and those with purely local (Holstein) interaction. A major result of our survey of the parameter space is the existence of extra-light hybrid singlet bipolarons consisting of an on-site and an off-site component on both square and triangular lattices. We also compute triplet properties of the bipolarons and the pair dispersion. For pair momenta on the edge of the Brillouin zone of the triangular lattice, we find that triplet states are more stable than singlets.

Item Type: Journal Item
Copyright Holders: 2010 The American Physical Society
ISSN: 1098-0121
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 22959
Depositing User: James Hague
Date Deposited: 09 Sep 2010 09:38
Last Modified: 07 Dec 2018 09:46
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