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Mass enhancement parameter in free-standing ultrathin Pb(111) films: The effect of spin-orbit coupling

AuthorsSklyadneva, Irina Yu.; Heid, Rolf; Bohnen, Klaus-Peter; Echenique, Pedro M. ; Chulkov, Eugene V.
Issue Date2013
PublisherAmerican Physical Society
CitationPhysical Review B 87: 085440 (2013)
AbstractThe influence of spin-orbit interaction on the electron-phonon coupling strength at the Fermi level of thin lead films is investigated using first-principles calculations in the density functional perturbation formalism. The calculations both scalar relativistic and including spin-orbit coupling (SOC) have been carried out for free-standing Pb(111) films consisting of four to ten atomic layers. It is shown that the spin-orbit interaction produces a large enhancement of the electron-phonon coupling strength regardless of the film thickness. This partly reflects a strong SOC-induced softening of the film phonon spectra, and partly a SOC-mediated increase in electron-phonon coupling matrix elements. For thin films, quantum size effects result in pronounced oscillations of the average coupling constant with the number of layers, which become damped for thicker films. © 2013 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.87.085440
Identifiersdoi: 10.1103/PhysRevB.87.085440
issn: 1098-0121
e-issn: 1550-235X
Appears in Collections:(CFM) Artículos
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