Role of elastic scattering in electron dynamics at ordered alkali overlayers on Cu(111).
نویسندگان
چکیده
Scanning tunneling spectroscopy of p(2 x 2) Cs and Na ordered overlayers on Cu(111) reveals similar line widths of quasi-two-dimensional quantum well states despite largely different binding energies. Detailed calculations show that 50% of the line widths are due to electron-phonon scattering while inelastic electron-electron scattering is negligible. The mechanism of enhanced elastic scattering due to Brillouin zone backfolding contributes the remaining width.
منابع مشابه
Valence-Electron Resonances in Alkali-Metal Overlayers Observed via Photoemission Line-Shape Changes.
Alkali metals adsorbed on metal surfaces attract interest as prototype examples of simple chemisorption [1] and simple metal quantum well systems [2]. In spite of the numerous studies made the electronic structure is still rather poorly characterized. So far, observations of the filled states have been limited to the discrete states that may be formed by alkali metal valence electrons in the en...
متن کاملPhotoinduced plasmon excitations in alkali-metal overlayers
Collective surface excitations in alkali-metal overlayers are observed using photoyield spectroscopy. Spectra for Na and K on Al~111! reveal a multipole surface plasmon and bulklike overlayer plasmon. In contrast, Li on Al exhibits only the multipole mode. In the submonolayer regime, all three alkali metals provide evidence for the threshold excitation. Time-dependent density-functional calcula...
متن کاملOptimal electron doping of a C60 monolayer on Cu(111) via interface reconstruction.
We demonstrate the charge state of C60 on a Cu(111) surface can be made optimal, i.e., forming C60(3-) as required for superconductivity in bulk alkali-doped C60, purely through interface reconstruction rather than with foreign dopants. We link the origin of the C60(3-) charge state to a reconstructed interface with ordered (4x4) 7-atom vacancy holes in the surface. In contrast, C60 adsorbed on...
متن کاملElectronic promoters and semiconductor oxidation: Alkali metals on Si(111) surfaces.
We examine the effect of thin (1-2 monolayers) overlayers of the lowelectronegativity Cs and Na metals on the oxidation of Si(111) cleavage surfaces. Synchrotron radiation photoemission studies of oxygen chemisorption as a function of overlayer thickness and oxygen exposure indicate large oxidation promotion effects and the formation of Si-oxide phases where high Si-oxidation states dominate. C...
متن کاملVibrational dynamics and band structure of methyl-terminated Ge(111).
A combined synthesis, experiment, and theory approach, using elastic and inelastic helium atom scattering along with ab initio density functional perturbation theory, has been used to investigate the vibrational dynamics and band structure of a recently synthesized organic-functionalized semiconductor interface. Specifically, the thermal properties and lattice dynamics of the underlying Ge(111)...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 95 17 شماره
صفحات -
تاریخ انتشار 2005