AC conductivity and magnetic dichroism of two-dimensional antiferromagnetic Dirac semimetals
arxiv(2024)
Abstract
We investigate the magneto-optical properties of two-dimensional
nonsymmorphic Dirac semimetals in the presence of antiferromagnetic order.
Using the Kubo formula, we calculate the conductivity tensor of two-dimensional
CuMnAs, a prototype antiferromagnetic Dirac material, as a function of light
frequency. From the finite-frequency conductivity tensor, we derive the dynamic
dielectric function and magnetic linear dichroism, demonstrating how they are
influenced by the orientation of the Néel order parameter. Adjusting the
Néel vector changes both the sign and amplitude of the system's
magneto-optical response. We propose that magnetic linear dichroism
spectroscopy is a powerful technique for determining the orientation of the
Néel vector.
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