Hole dynamics in a quantum-well state at Na/Cu(111)

Article

关键词: SURFACE ELECTRONIC-STRUCTURE;    IMAGE POTENTIAL STATES;    METAL-SURFACES;    NA OVERLAYERS;    SINGLE-LAYER;    CU(111);    PHOTOEMISSION;    SCATTERING;    LIFETIME;    AL(001);   

DOI  :  10.1103/PhysRevB.68.195422

来源: SCIE

【 摘 要 】

Theoretical calculations and scanning-tunneling spectroscopy measurements of the hole lifetime broadening, tau(-1), in a quantum-well state for 0.95 and 1.0 monolayers of Na on Cu(111) are reported. A model potential is proposed for calculating quantum-well states in a monolayer on metal surfaces. The inelastic electron-electron contribution, tau(e-e)(-1), is evaluated within the GW approximation by using eigenfunctions and eigenenergies obtained with this model potential. The electron-phonon contribution, tau(e-ph)(-1), is computed by employing Debye and Einstein models as well as a first-principle ultrasoft pseudopotential method. The obtained theoretical results are in excellent agreement with experimental data, both showing a surprisingly large difference in the lifetime broadening for 0.95 and 1.0 monolayers which is attributed mostly to changes in the electronic structure.

【 授权许可】

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