Fig. 6: Mechanism of moving type-I (up) polarons.
From: Manipulating single excess electrons in monolayer transition metal dihalide
a Typical trace of tip height switching as a function of time, showing hopping of a type-I (up) polaron between two neighboring Co sites. The trace is recorded at 1.68 V and 10 pA. b Bias-dependent switching rate extracted in a similar manner as (b). The black line is a fitting to the data below 1.7 V with an exponential relation. Inset is a schematic drawing, showing hopping of the excess electron (red ball and circle) between onsite Co and NN Co sites. The hopping barrier (blue curve) is reduced (dashed curve) by tip electric field. c Switching rate of polaron hopping extracted from similar data as (a) recorded at different bias and current settings. The solid lines are the fittings to the data with the relation \({{{{{\rm{R}}}}}}\propto {I}^{N}\) for different biases. Note that the data in (b) and (c) are plotted in logarithmic coordinate.
