Related Experiment Video
Updated: Jun 19, 2026

Picometer-Precision Atomic Position Tracking through Electron Microscopy
Published on: July 3, 2021
Observation of a novel orbital selective Mott transition in Ca(1.8)Sr(0.2)RuO(4)
M Neupane1, P Richard, Z-H Pan
1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Abstract:
We observed a novel orbital selective Mott transition in Ca(1.8)Sr(0.2)RuO(4) by angle-resolved photoemission. While two sets of dispersing bands and the Fermi surface associated with the doubly degenerate d(yz) and d(zx) orbitals are identified, the Fermi surface associated with the wider d(xy) band is missing as a consequence of selective Mott localization. Our theoretical calculations demonstrate that this orbital selective Mott transition is mainly driven by the combined effects of interorbital carrier transfer, superlattice potential, and orbital degeneracy, whereas the bandwidth difference plays a less important role.
Related Concept Videos
UV–Vis Spectroscopy: Molecular Electronic Transitions
Properties of Transition Metals
Molecular Orbital Theory II
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Electron Configurations
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s,...
Molecular Orbital Theory I

