Advances in Momentum-Resolved Dispersion Investigations via Monochromated Electron Energy-Loss Spectroscopy

π-Plasmon Dispersion in Free-Standing Monolayer Graphene Investigated by Momentum-Resolved Electron Energy-Loss Spectroscopy

Graphene is a single layer of carbon atoms densely packed in a honeycomb lattice with each carbon atom accommodating four valence electrons: one π electron and three σ electrons [1]. The lone unpaired π electron in the half-filled pz orbital would form a π bond with the neighboring carbon atoms leading to delocalized π bands. Three σ electrons, sp 2 -hybridized with neighboring three carbon ato...

Momentum-Dependent Charge Transfer Excitations in Sr2CuO 2Cl2 Angle-Resolved Electron Energy Loss Spectroscopy.

Electron-hole pair excitations in the insulating cuprates Sr2CuO2Cl2 were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in Cu − O2 plane. The former show a large energy dispersion ∼ 1.5eV along [110], and the latter appear at a higher energy position (∼ 4.5eV) only along [100],...

Recent Advances in Electron Momentum Spectroscopy *

The flexibility of the (e, 2e) technique or "electron momentum spectroscopy" (EMS) in obtaining information on the electronic structure of atoms, molecules, and solids is demonstrated. Highresolution EMS measurements for argon, including the first measurements of momentum profiles belonging to the 2 P° and D-manifolds, are used to demonstrate the technique for atomic targets. The d-wave transit...

Nanoscale mapping of optical band gaps using monochromated electron energy loss spectroscopy.

Using monochromated electron energy loss spectroscopy in a probe-corrected scanning transmission electron microscope we demonstrate band gap mapping in ZnO/ZnCdO thin films with a spatial resolution below 10 nm and spectral precision of 20 meV.

Characterization of InGaN/GaN quantum well growth using monochromated valence electron energy loss spectroscopy