X-ray Dichroism in Noncetrosymmetric crystals

TL;DR

This paper provides a theoretical framework for analyzing x-ray dichroism in noncentrosymmetric crystals, revealing how these effects are sensitive to microscopic polar and magnetoelectric properties, thus advancing understanding of crystalline materials.

Contribution

The work extends previous theories to noncentrosymmetric systems, offering new insights into x-ray absorption spectroscopy of polar and magnetoelectric properties.

Findings

X-ray dichroism is sensitive to microscopic polar properties.

Theoretical description aligns with recent experimental observations.

New analysis methods for noncentrosymmetric crystals are proposed.

Abstract

In this paper the authors analyse near-edge absorption of x rays in noncentrosymmetric crystals. The work is motivated by recent observations of x-ray dichroic effects which stems from parity-nonconserving electron interactions. We provide a theoretical description of these experiments and show that they are sensitive to microscopic {\it polar} and {\it magnetoelectric} properties of the sample. Our derivation extends previous theoretical work on centrosymmetric systems and identifies new directions in the microscopic analysis of crystalline materials using x-ray absorption spectroscopy.