Surface-State Lifetime Measured by Scanning Tunneling Spectroscopy

Abstract

Quasiparticle interactions broaden spectral features at surfaces, which can be measured using the scanning tunneling microscope (STM). We report the first study of lifetime effects on Shockley surfacestate electrons using low-temperature STM spectroscopy. Data taken from Ag(111) are analyzed using detailed tunneling calculations and a simple model, and are found to correspond to a self-energy of S 4.9 6 0.6 meV. This is considerably below values determined by angle-resolved photoemission, but remains higher than theoretical predictions. [S0031-9007(98)07612-1]

Decay of electronic excitations at metal surfaces

“…First measurements of electronic lifetimes t reported by Li et al [187] were based on an analysis of the width of the surface-state-induced rise in dI=dV tunneling spectra. As evident from Fig.…”

Site-Specific Polarization Screening in Organic Thin Films

“…The most striking observation is the energy dispersity of the LUMO, with E A ¼ 0:8 eV, E B ¼ 0:95 eV, E B 0 ¼ 1:10 eV, E D 0 ¼ 1:42 eV, E D ¼ 1:68 eV, E C ¼ 1:84 eV, and E E ¼ 1:87 eV [20]. Since STS is sensitive to final state effects [21], contributions of polarization screening must be present in the spectra of Fig. 3(b).…”

Snell’s Law for Surface Electrons: Refraction of an Electron Gas Imaged in Real Space

“…2(e)), as was done for the clean Cu surface [1,2,20]. The band minimum E 0 was obtained by recording the dI/dV signal at a fixed position as a function of energy [20,21] (crosses in Fig. 2(e)) and is shifted upward in energy by (230 ± 30) meV in the case of the adsorption of an insulating NaCl overlayer.…”