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- W2560991708 abstract "Although phonon-mediated thermal conduction in pristine graphene and hexagonal boron nitride is well understood, less is known about phonon transport in single-sheet graphene-hexagonal boron nitride ($mathrm{Gr}/hensuremath{-}mathrm{BN}$) lateral heterostructures, where the thermal resistance of the interfaces plays an important role in the overall thermal conductivity. We apply the newly developed extended atomistic Green's function method to analyze with detail the effect of strain and structure engineering on the thermal conductance ${G}_{mathrm{int}}$ of the $mathrm{Gr}/hensuremath{-}mathrm{BN}$ interface. Our calculations show that longitudinal tensile strain leads to significant ${G}_{mathrm{int}}$ enhancement (up to $25%$ at 300 K) primarily through the improved alignment of the flexural acoustic phonon bands, despite the reduction in the longitudinal acoustic (LA) and transverse acoustic phonon velocities. In addition, we find that alternating C-N zigzag bonds along the zigzag interface lead to a greater ${G}_{mathrm{int}}$ than C-B bonds through more effective transmission of high-frequency LA and transverse optical phonons, especially at high strain levels. We also demonstrate how the interfacial structure dramatically affects the orientation of the transmitted optical phonons, a phenomenon that is neither seen for acoustic phonons nor predictable from conventional acoustic wave scattering theory. Insights from our paper can provide the basis for manipulating the interfacial thermal conductance in other two-dimensional heterostructures." @default.
- W2560991708 created "2017-01-06" @default.
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- W2560991708 date "2016-02-02" @default.
- W2560991708 modified "2023-09-23" @default.
- W2560991708 title "Controlling the thermal conductance of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mtext>graphene</mml:mtext><mml:mo>/</mml:mo><mml:mi>h</mml:mi><mml:mo>−</mml:mo><mml:mi>BN</mml:mi></mml:math>lateral interface with strain and structure engineering" @default.
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- W2560991708 doi "https://doi.org/10.1103/physrevb.93.075406" @default.
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