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Origin of circular dichroism in resonant elastic x-ray scattering from magnetic and polar chiral structures

DOI: 10.1103/PhysRevB.106.035116 DOI Help

Authors: Kook Tae Kim (Soongsil University) , Jung Yun Kee (Soongsil University) , Margaret R. Mccarter (University of California, Berkeley) , Gerrit Van Der Laan (Diamond Light Source) , Vladimir A. Stoica (Advanced Photon Source; The Pennsylvania State University) , John W. Freeland (Advanced Photon Source) , Ramamoorthy Ramesh (University of California, Berkeley; Lawrence Berkeley National Laboratory) , Se Young Park (Soongsil University) , Dong Ryeol Lee (Soongsil University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 106 , PAGES 035116

State: Published (Approved)
Published: July 2022

Abstract: Circular dichroism in resonant elastic x-ray scattering (CD-REXS) has recently been observed in chiral structures composed of multiferroic materials as well as magnetic moments or electric polarization vectors. In order to comprehensively understand the experimental results of these previous studies, we present here in detail the analytical formulation of CD-REXS for one-dimensional helices composed of magnetic moments and electric polarization vectors, respectively. In particular, by comparing CD-REXS for a proper-screw-shaped Bloch-type helix and cycloid-shaped Néel-type helix, we found that CD-REXS for both magnetic and polar helices can discriminate between both types of helices.We also found that the x-ray polarization factor depending on the scattering geometry is a significant factor in determining the characteristics of CD-REXS for chiral structures. The results obtained from the detailed formulas can be intuitively understood using the concept of mirror reflection. In particular, in this way it can be understood that Bloch- and Néel-type helices correspond to truly chiral and achiral structures, respectively, and why CD-REXS is able to distinguish between these two types of helices.

Journal Keywords: XMCD; ferroelectrics; chirality

Diamond Keywords: Ferroelectricity

Subject Areas: Physics, Materials

Technical Areas: Theoretical Physics

Added On: 28/07/2022 07:43

Discipline Tags:

Quantum Materials Physics Magnetism Materials Science Theoretical Physics

Technical Tags: