Figure3

Figure 3. Experimental investigations of the nonlinear Hall response in WTe₂ and MnBi₂Te₄. (A) the $$ E_{\bot}^{2\omega} $$ depends linearly on the $$ (E_{\parallel})^{2} $$ at different temperatures. (B) The temperature dependence of $$ \sigma $$. (C) The nonlinear Hall signal as a function of the $$ \sigma^{2} $$. (D) The nonlinear longitudinal $$ V_{x}^{2\omega} $$ and transverse $$ V_{y}^{2\omega} $$ responses as a function of the input current. (E) The conductivity and carrier density of four septuple layers MnBi₂Te₄ at temperatures ranging from 2 to 30 K. (F) The nonlinear conductivity $$ \sigma_{yxx}^{2\omega} $$ ($$ \sigma_{xxx}^{2\omega} $$) as a function of the $$ \sigma_{xx}^{2} $$. (A-C) reprinted with permission^[22], 2019, CC BY license. (D-F) reprinted with permission^[26], 2023, CC BY license.