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Giant Frictional Drag in Double Bilayer Graphene Heterostructures

Kayoung Lee, Jiamin Xue, David C. Dillen, Kenji Watanabe, Takashi Taniguchi, and Emanuel Tutuc
Phys. Rev. Lett. 117, 046803 – Published 18 July 2016
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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 10K, 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=1.5K. 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.

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  • Received 28 February 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.046803

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

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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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Authors & Affiliations

Kayoung Lee1, Jiamin Xue1, David C. Dillen1, Kenji Watanabe2, Takashi Taniguchi2, and Emanuel Tutuc1

  • 1Microelectronics Research Center, The University of Texas at Austin, Austin, Texas 78758, USA
  • 2National Institute of Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

See Also

Negative Coulomb Drag in Double Bilayer Graphene

J. I. A. Li, T. Taniguchi, K. Watanabe, J. Hone, A. Levchenko, and C. R. Dean
Phys. Rev. Lett. 117, 046802 (2016)

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Vol. 117, Iss. 4 — 22 July 2016

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