Multiband Mechanism for the Sign Reversal of Coulomb Drag Observed in Double Bilayer Graphene Heterostructures

M. Zarenia, A. R. Hamilton, F. M. Peeters, and D. Neilson
Phys. Rev. Lett. 121, 036601 – Published 17 July 2018

Abstract

Coupled 2D sheets of electrons and holes are predicted to support novel quantum phases. Two experiments of Coulomb drag in electron-hole (eh) double bilayer graphene (DBLG) have reported an unexplained and puzzling sign reversal of the drag signal. However, we show that this effect is due to the multiband character of DBLG. Our multiband Fermi liquid theory produces excellent agreement and captures the key features of the experimental drag resistance for all temperatures. This demonstrates the importance of multiband effects in DBLG: they have a strong effect not only on superfluidity, but also on the drag.

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  • Received 29 January 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.036601

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Zarenia1,2, A. R. Hamilton3, F. M. Peeters1, and D. Neilson1,4

  • 1Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
  • 2Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA
  • 3ARC Centre of Excellence for Future Low Energy Electronics Technologies, School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia
  • 4Physics Division, Science & Technology School, University of Camerino, 62032 Camerino, Italy

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Issue

Vol. 121, Iss. 3 — 20 July 2018

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