Fig. 2: Dependence of the e-e scattering length on distance to the gate.
From: Control of electron-electron interaction in graphene by proximity screening
a \(\ell _{{\mathrm{ee}}}(T)\) extracted from Hall viscosity measurements for the given \(n\). Data for a close-gate device (blue symbols) are compared with a reference (green). b Density dependence of \(\ell _{{\mathrm{ee}}}\) at \(200\,{\mathrm{K}}\) (same color coding as in a). The gray-shaded region indicates the regime near the NP where the single-component hydrodynamic theory is not applicable12,13,20 and, also, the cyclotron diameter became comparable with the width of our devices15. c \(\ell _{{\mathrm{ee}}}\) as a function of \(d\) for the given \(n\) and \(T\). Red and blue symbols: Results from Hall viscosity and point-contact measurements, respectively; shown are the average values for electron and hole doping (see panel b for an example of scatter due to electron–hole asymmetry). For all the panels, the solid curves are theoretical results (Supplementary Note 4).
