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 () lower than , we observe a large anomalous negative drag emerging predominantly near the drag layer charge neutrality. The anomalous drag resistivity increases dramatically with reducing , and becomes comparable to the layer resistivity at the lowest . At low 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.
- Received 28 February 2016
DOI:https://doi.org/10.1103/PhysRevLett.117.046803
© 2016 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Chasing the Exciton Condensate
Published 18 July 2016
Unusual interactions between charges have been observed in two closely separated graphene bilayers, a promising system in which to create a condensate of electron-hole pairs.
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