Coulomb drag mechanisms in graphene

J. C.W. Song, D. A. Abanin, L. S. Levitov

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Recent measurements revealed an anomalous Coulomb drag in graphene, hinting at new physics at charge neutrality. The anomalous drag is explained by a new mechanism based on energy transport, which involves interlayer energy transfer, coupled to charge flow via lateral heat currents and thermopower. The old and new drag mechanisms are governed by distinct physical effects, resulting in starkly different behavior, in particular for drag magnitude and sign near charge neutrality. The new mechanism explains the giant enhancement of drag near charge neutrality, as well as its sign and anomalous sensitivity to the magnetic field. Under realistic conditions, energy transport dominates in a wide temperature range, giving rise to a universal value of drag which is essentially independent of the electron-electron interaction strength.

Original languageEnglish (US)
Pages (from-to)3631-3637
Number of pages7
JournalNano Letters
Volume13
Issue number8
DOIs
StatePublished - Aug 14 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • Coulomb drag
  • Graphene
  • energy transport
  • two-fluid model

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