Details

Autor(en) / Beteiligte

• Li, J I A
• Taniguchi, T
• Watanabe, K
• Hone, J
• Levchenko, A
• Dean, C R

Titel

Negative Coulomb Drag in Double Bilayer Graphene

Ist Teil von

• Physical review letters, 2016-07, Vol.117 (4), p.046802-046802, Article 046802

Ort / Verlag

United States

Erscheinungsjahr

2016

Quelle

American Physical Society

Beschreibungen/Notizen

• We report on an experimental measurement of Coulomb drag in a double quantum well structure consisting of bilayer-bilayer graphene, separated by few layer hexagonal boron nitride. At low temperatures and intermediate densities, a novel negative drag response with an inverse sign is observed, distinct from the momentum and energy drag mechanisms previously reported in double monolayer graphene. By varying the device aspect ratio, the negative drag component is suppressed and a response consistent with pure momentum drag is recovered. In the momentum drag dominated regime, excellent quantitative agreement with the density and temperature dependence predicted for double bilayer graphene is found.