Orbital-Resolved Soft X-Ray Spectroscopy in NaV2O5
G P. Zhang, G T. Woods, Eric L. Shirley, T A. Callcott, L Lin, B. C. Sales, D Mandrus, G S. Chang, J He
We demonstrate that angle-resolved soft x-ray spectroscopy can resolve absorption by inequivalent oxygen sites and by different orbitals belonging to the same site. By rotating the polarization direction, we see a dramatic change in the absorption spectra at the oxygen K edge in NaV2 O5. Our theory identifies the detailed composition of the spectra, and predicts a correct energy-ordering of the orbitals of three inequivalent oxygen atoms. Because different orbitals dominate absorption spectra at different energies, one can use this to excite the system at a specific orbital energy. In contrast, the vanadium edge does not show a big change when varying the polarization direction. The reason for this is that different excitation channels (involving different initial states for the excited electron) overlap in energy, and that the channels' polarization-dependent spectra vary in different, compensating ways, obscuring each channel's sensitive polarization dependence.
Physical Review B (Condensed Matter and Materials Physics)
, Woods, G.
, Shirley, E.
, Callcott, T.
, Lin, L.
, Sales, B.
, Mandrus, D.
, Chang, G.
and He, J.
Orbital-Resolved Soft X-Ray Spectroscopy in NaV<sub>2</sub>O<sub>5</sub>, Physical Review B (Condensed Matter and Materials Physics)
(Accessed December 2, 2023)