Abstract
Violation of parity symmetry gives rise to various physical phenomena such as nonlinear transport and cross-correlated responses. In particular, the nonlinear conductivity has been attracting a lot of attentions in spin-orbit coupled semiconductors, superconductors, topological materials, and so on. In this paper we present theoretical study of the nonlinear conductivity in odd-parity magnetic multipole ordered systems whose $\mathcal{PT}$-symmetry is essentially distinct from the previously studied acentric systems. Combining microscopic formulation and symmetry analysis, we classify the nonlinear responses in the $\mathcal{PT}$-symmetric systems as well as $\mathcal{T}$-symmetric (non-magnetic) systems, and uncover nonlinear conductivity unique to the odd-parity magnetic multipole systems. A giant nonlinear Hall effect, nematicity-assisted dichroism and magnetically-induced Berry curvature dipole effect are proposed and demonstrated in a model for Mn-based magnets.
Highlights
Nonlinear responses have been giving rise to a lot of research interest in condensed matter physics
In this paper we present a theoretical study of the nonlinear conductivity in odd-parity magnetic multipole ordered systems whose PT symmetry is essentially distinct from the previously studied acentric systems
We find that the nonlinear conductivity (NLC) at H = 0 is a measure of the antisymmetric spin-orbit coupling (ASOC)
Summary
Nonlinear responses have been giving rise to a lot of research interest in condensed matter physics. A key to the odd-parity magnetic multipole order is locally noncentrosymmetric property of crystals. With such structure of crystals, the local site symmetry of atoms does not have P symmetry the global P symmetry is preserved owing to the sublattice degree of freedom [20,21]. In this work the NLC in odd-parity magnetic multipole metals are investigated. We reveal two types of fieldinduced NLC; the nematicity-assisted dichroism, and Berry curvature dipole effect induced by what we call magnetic ASOC. These phenomena originate from locally noncentrosymmetric crystal structures and magnetic order, and have striking difference from the NLC in noncentrosymmetric (nonmagnetic) crystals.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
