Controllable Thermal Conductivity in Twisted Homogeneous Interfaces of Graphene and Hexagonal Boron Nitride

Wengen Ouyang, Huasong Qin, Michael Urbakh, Oded Hod

Research output: Contribution to journalArticlepeer-review

Abstract

Thermal conductivity of homogeneous twisted stacks of graphite is found to strongly depend on the misfit angle. The underlying mechanism relies on the angle dependence of phonon-phonon couplings across the twisted interface. Excellent agreement between the calculated thermal conductivity of narrow graphitic stacks and corresponding experimental results indicates the validity of the predictions. This is attributed to the accuracy of interlayer interaction descriptions obtained by the dedicated registry-dependent interlayer potential used. Similar results for h-BN stacks indicate overall higher conductivity and reduced misfit angle variation. This opens the way for the design of tunable heterogeneous junctions with controllable heat-transport properties ranging from substrate-isolation to efficient heat evacuation.

Original languageEnglish
Pages (from-to)7513-7518
Number of pages6
JournalNano Letters
Volume20
Issue number10
DOIs
StatePublished - 14 Oct 2020

Keywords

  • Interfacial thermal conductivity
  • graphite
  • h-BN
  • misfit angle
  • phonon-phonon coupling
  • registry-dependent interlayer potential
  • twisted interface

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