Fig. 2: Nonlinear Hall response in NbIrTe4.
From: Spin-orbit-splitting-driven nonlinear Hall effect in NbIrTe4
a Second-harmonic \({V}_{\perp }^{2\omega }\) as a function of the AC current amplitude Iω scaling quadratically in a 15-nm-thick flake of NbIrTe4 at 2 K. The black solid line is a quadratic fit to the data. The current is along the a-axis. Green cross bars in the inset represent the geometry of the measurements. The applied current is injected from the source (S) electrode to the drain (D) electrode, and the voltage is measured between the A and B electrodes. A sign change occurs upon simultaneous reversal of both the applied current direction and the corresponding Hall probes. b Temperature dependence of the NLHE and a sizable NLH signal at room temperature, with a sign change at ~150 K.
