Figure 2.

Nonlinear Hall effect in Td-TaIrTe4. (a) Optical image of a 12-electrode device with active areas protected by hBN. (b) First-harmonic
as a function of
at 100 K. (c) Second- and third-harmonic
(n = 2, 3) as a function of
at 100 K. (d) Third-harmonic
as a function of
measured at 300 K and the signals were taken from the as prepared and after one month or three months. All measured voltage signals at the transverse direction are perpendicular to the current direction, which is marked in (a).