Naslov
Photoemission and DFT study of Ir(111) ; energy band gap mapping

Autori
Pletikosić, Ivo ; Kralj, Marko ; Šokčević, Damir ; Brako, Radovan ; Lazić, Predrag ; Pervan, Petar

Izvornik
Journal of physics. Condensed matter (0953-8984) 22 (2010), 13; 135006-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
iridium; band structure; graphene; electronic properties; angle resolved photoemission; low index single crystal surfaces; density functional theory

Sažetak
We have performed combined angle resolved photoemission spectroscopy (ARPES) experiments and density functional theory (DFT) calculations of the electronic structure of 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 K symmetry point. In accordance with DFT calculation, ARPES has shown a wide energy band gap with shape of parallelogram centred around the K 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA