One-dimensional antilocalization of electrons from spin disorder probed by nonlinear Hall effect*

Over the past few years, nonreciprocal transport measurement has emerged as a probe of spin orbit interaction, spin texture, superconductivity and other fundamental properties of materials [1]. In this presentation, we report on the nonlinear Hall effect (NLHE) in Bi₂Se₃/CoFeB heterostructures measured by second harmonic voltage method. Magneto-optical Kerr effect and transport measurements point the origin of the NLHE to be the asymmetric magnon scattering mechanism [2]. Moreover, a linear relation between the nonlinear Hall resistance and the electron phase coherence length of Bi₂Se₃ is observed between 5 and 50 K. We propose a phenomenological model and suggest the enhancement of the NLHE below 50 K as evidence for strict one-dimensional antilocalization of electrons from spin disorder [3].

[1] Y. Tokura and N. Nagaosa, Nat. Commun. 9, 3740 (2018).
[2] K. Yasuda, et al., Phys. Rev. Lett. 119, 137204 (2017).
[3] Y. Wang, et al., Phys. Rev. B 102, 125430 (2020).