Intrinsic nonlinear Hall effect in antiferromagnetic tetragonal CuMnAs
ORAL
Abstract
Detecting the orientation of the N\'eel vector is a major research topic in antiferromagnetic spintronics. Here we recognize the intrinsic nonlinear Hall effect, which is independent of the relaxation time, as a prominent contribution to the time-reversal-odd second order conductivity and can be used to detect the flipping of the Neel vector. In contrast, the Berry-curvature-dipole-induced nonlinear Hall effect depends linear on relaxation time and is time-reversal-even. We study the intrinsic nonlinear Hall effect in an antiferromagnetic metal: tetragonal CuMnAs, and show that its nonlinear Hall conductivity can reach the order of mA/V^2. The dependence on the chemical potential of such nonlinear Hall conductivity can be qualitatively explained by a tilted massive Dirac model. Moreover, we demonstrate its strong temperature dependence and briefly discuss its competition with the second order Drude conductivity. Finally, a complete survey of magnetic point groups are presented, providing guidelines for finding more antiferromagnetic materials with the intrinsic nonlinear Hall effect.
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Publication: https://arxiv.org/abs/2106.12695
Presenters
Chong Wang
Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA, Carnegie Mellon Univ, University of Washington, University of Washington, Seattle, Carnegie Mellon University
Authors
Chong Wang
Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA, Carnegie Mellon Univ, University of Washington, University of Washington, Seattle, Carnegie Mellon University
Yang Gao
University of Science and Technology of China
Di Xiao
University of Washington, Department of Physics, University of Washington, Seattle, WA, USA. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA, University of Washington, Seattle
