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Experimental technique and interband-to-intraband heating transition.
Illustration of the optical pump-terahertz probe measurement technique and the gate-tunable graphene device design. By applying a gate voltage Vg to the polymer electrolyte, the Fermi energy of graphene is changed and thereby its DC conductivity, σ0. By applying a source-drain voltage VSD between the two contacts and measuring the current ISD, σ0 can be extracted. Graphic: ICFO / Scientific Advances.
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