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 $\approx 70\,{\rm{K}}$, the drag signal is consistent with momentum exchange. In all discussed regimes, the Onsager relation is respected. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000211876Publication status
publishedExternal links
Journal / series
New Journal of PhysicsVolume
Pages / Article No.
Publisher
Institute of PhysicsSubject
Coulomb drag; graphene; GaAs; Electron gasOrganisational unit
03439 - Ensslin, Klaus / Ensslin, Klaus
03759 - Faist, Jérôme / Faist, Jérôme
08835 - Ihn, Thomas (Tit.-Prof.)
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