Fig. 2: Dependence of NLAHE on crystal axis and thickness.
From: Giant c-axis nonlinear anomalous Hall effect in Td-MoTe2 and WTe2
a Upper panels: DC and second harmonic \(V_{xz}\) vs. first harmonic \(V_{xx}^2\) for \(I\parallel a\) and \(I\parallel b\) in 127-nm-thick sample at 2 K. Lower panels: analogous second harmonic measurements for in-plane response show significantly weaker signal under comparable bias. b NLAHE strength \(E_z^{2\omega }/\left( {E_x^\omega } \right)^2\) and residual longitudinal conductivity \(\sigma _{xx0}\) vs. sample thickness for \(I\parallel a\) and \(I\parallel b\). Both values are larger for greater thickness and \(I\parallel a\).
