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Electron-phonon effects on spin-orbit split bands of two-dimensional systems (Articolo in rivista)

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Electron-phonon effects on spin-orbit split bands of two-dimensional systems (Articolo in rivista) (literal)

Anno

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Alternative label

E. Cappelluti (1,2); C. Grimaldi (3,4); F. Marsiglio (5) (2007)
Electron-phonon effects on spin-orbit split bands of two-dimensional systems
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

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(1) SMC Research Center, INFM-CNR c/o Department of Physics, University \"La Sapienza,\" P.le A. Moro 2, 00185 Roma, Italy (2) Istituto dei Sistemi Complessi (ISC), CNR, v. dei Taurini 19, 00185 Roma, Italy (3) Max-Plank-Institut für Physik Komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden Germany (4) LPM, Ecole Polytechnique Fédérale de Lausanne, Station 17, CH-1015 Lausanne, Switzerland (5) Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1 (literal)

Titolo

Electron-phonon effects on spin-orbit split bands of two-dimensional systems (literal)

Abstract

The electronic self-energy is studied for a two-dimensional electron gas coupled to a spin-orbit Rashba field and interacting with dispersionless phonons. For the case of a momentum independent electron-phonon coupling (Holstein model) we solve numerically the self-consistent noncrossing approximation for the self-energy and calculate the electron mass enhancement m(*)/m and the spectral properties. We find that, even for nominal weak electron-phonon interaction, for strong spin-orbit couplings the electrons behave as effectively strongly coupled to the phonons. We interpret this result by a topological change of the Fermi surface occurring at sufficiently strong spin-orbit coupling, which induces a square-root divergence in the electronic density of states at low energies. We provide results for m(*)/m and for the density of states of the interacting electrons for several values of the electron filling and of the spin-orbit interaction. (literal)

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