Giant Frictional Drag in Double Bilayer Graphene Heterostructures
Abstract
We study the frictional drag between carriers in two bilayer graphene flakes separated by a 2-5 nm thick hexagonal boron nitride dielectric. At temperatures (T ) lower than ∼10 K , we observe a large anomalous negative drag emerging predominantly near the drag layer charge neutrality. The anomalous drag resistivity increases dramatically with reducing T , and becomes comparable to the layer resistivity at the lowest T =1.5 K . At low T the drag resistivity exhibits a breakdown of layer reciprocity. A comparison of the drag resistivity and the drag layer Peltier coefficient suggests a thermoelectric origin of this anomalous drag.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2016
- DOI:
- 10.1103/PhysRevLett.117.046803
- arXiv:
- arXiv:1603.00757
- Bibcode:
- 2016PhRvL.117d6803L
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 5 pages, 4 figures, supplementary material uploaded as an ancillary file