Large polaron formation induced by Rashba spin-orbit coupling

Details Large polaron formation induced by Rashba spin-orbit coupling Large polaron formation induced by Rashba spin-orbit coupling

2009-11-17

arxiv.org/abs/0911.3206v2

Phys. Rev. B vol.81, 075306 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, version as published

Scientific paper

Here the electron-phonon Holstein model with Rashba spin-orbit interaction is studied for a two dimensional square lattice in the adiabatic limit. It is demonstrated that a delocalized electron at zero spin-orbit coupling localizes into a large polaron state as soon as the Rashba term is nonzero. This spin-orbit induced polaron state has localization length inversely proportional to the Rashba coupling $\gamma$, and it dominates a wide region of the $\gamma$-$\lambda$ phase diagram, where $\lambda$ is the electron-phonon interaction.

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