Angle Resolved Photoelectron Spectroscopy in the hν Region of ~15 to 200 eV

Abstract

AbstractAngle-resolved photoelectron spectroscopy (ARPES) is performed in most cases on single crystal sample surfaces. Momentum information becomes available in ARPES, facilitating the experimental evaluation of band dispersions. By fully utilizing the energy distribution curves (EDCs) and momentum distribution curves (MDCs), the Fermi surface (FS) topology can be quantitatively estimated. By use of the polarized light excitation, the ARPES spectra can provide useful information on the parity of the initial states. In the low hν excitation in ~15–200 eV, however, the λmp is rather short for the electrons from the region near EF and the kz (z ⊥ surface) dependence of the band dispersions and FS topology is rather difficult to be accurately evaluated in most cases. Then 2D and 1D dispersions were mostly studied by ARPES up to now. Examples of layer materials, rare earth compounds, 1D materials, topological insulators, superconductors and quantum well states (QWS) are discussed in this order.