Abstract
We report on Coulomb drag experiments between a bilayer graphene flake and a GaAs two-dimensional electron gas, where the charge-carrier densities of both systems can be tuned independently. For both p- and n-type graphene charge carriers, we observe that the Coulomb drag unexpectedly changes direction when the temperature is lowered. We find this phenomenon to be dominant when the Fermi wave vector in graphene is larger than in GaAs. At temperatures above , the drag signal is consistent with momentum exchange. In all discussed regimes, the Onsager relation is respected.
Highlights
Coulomb drag is a direct measure of the interactions between charge carriers located in two close-by conductors [1]
In (b), Ggr in minimal conductance is shown along a straight line when the 2DEG exists, which we identify with the graphene charge neutrality point
We report on Coulomb drag measurements in a hybrid system consisting of a bilayer graphene flake transferred onto a GaAs/AlGaAs heterostructure hosting a 34 nm deep 2DEG
Summary
We report on Coulomb drag experiments between a bilayer graphene flake and a GaAs two-. Any further distribution of dimensional electron gas, where the charge-carrier densities of both systems can be tuned this work must maintain attribution to the independently. For both p- and n-type graphene charge carriers, we observe that the Coulomb drag author(s) and the title of the work, journal citation unexpectedly changes direction when the temperature is lowered. We find this phenomenon to be and DOI.
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