Photoemission and density functional theory study of Ir(111); energy band gap mapping
I Pletikosić1, M Kralj, D Sokčević
1Institut za fiziku, Zagreb, Croatia.
Abstract:
We have performed combined angle-resolved photoemission spectroscopy (ARPES) experiments and density functional theory (DFT) calculations of the electronic structure of the Ir(111) surface, with the focus on the existence of energy band gaps. The investigation was motivated by the experimental results suggesting Ir(111) as an ideal support for the growth of weakly bonded graphene. Therefore, our prime interest was electronic structure around the [Formula: see text] symmetry point. In accordance with DFT calculations, ARPES has shown a wide energy band gap with the shape of a parallelogram centred around the [Formula: see text] point. Within the gap three surface states were identified; one just below the Fermi level and two spin-orbit split surface states at the bottom of the gap.
Related Concept Videos
IR Spectrum
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
UV–Vis Spectroscopy: Molecular Electronic Transitions
IR Spectrum Peak Intensity: Dipole Moment
IR Frequency Region: X–H Stretching
IR Absorption Frequency: Delocalization
In IR spectroscopy,...
Infrared (IR) Spectroscopy: Overview
Different compounds display unique properties due to their...


