Electronic Correlations in Vanadium Revealed by Electron-Positron Annihilation Measurements

TL;DR

This study uses electron-positron annihilation measurements to investigate vanadium's electronic structure, confirming the importance of dynamic self-energy corrections in theoretical models for accurate Fermi surface predictions.

Contribution

The paper demonstrates that combining ACAR measurements with DMFT calculations accurately reveals vanadium's Fermi surface, highlighting the role of local, dynamic self-energy corrections.

Findings

Excellent agreement between experimental data and DMFT predictions

Dynamic self-energy corrections influence momentum density anisotropy

Reconstruction of the full Fermi surface from five 2D projections

Abstract

The electronic structure of vanadium measured by Angular Correlation of electron-positron Annihilation Radiation (ACAR) is compared with the predictions of the combined Density Functional and Dynamical Mean-Field Theory (DMFT). Reconstructing the momentum density from five 2D projections we were able to determine the full Fermi surface and found excellent agreement with the DMFT calculations. In particular, we show that the local, dynamic self-energy corrections contribute to the anisotropy of the momentum density and need to be included to explain the experimental results.