Figure 3.

Differential conductance<a onClick="popup('http://www.nanoscalereslett.com/content/8/1/335/mathml/M2','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/8/1/335/mathml/M2">View MathML</a>of (a) tri- and (b) four-layer graphene as function of temperature T−1/2. The fit line shows good consistency with the Efros-Shklovskii (ES) variable-range-hopping (VRH) model at the low DC electric field, and the results clearly indicate that Coulomb scattering is the dominant scattering mechanism in our system.

Liu et al. Nanoscale Research Letters 2013 8:335   doi:10.1186/1556-276X-8-335
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