Figure 4

(a,b) Numerical derivative of the current as a function of the source-drain bias voltage observed in other samples with different insulators \(\hbox {SiO}_2\) (a) and SiN/\(\hbox {SiO}_2\).

(a,b) Numerical derivative of the current as a function of the source-drain bias voltage observed in other samples with different insulators \(\hbox {SiO}_2\) (a) and SiN/\(\hbox {SiO}_2\).