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By interlayer sliding in van der Waals (vdW) materials, the switchingelectric polarization of ultrathin ferroelectric materials leads to the widelystudied slidetronics. In this work, we report that such sliding can furthertailor anharmonic effects and hence thermal transport properties due to thechanged intrinsic coupling between atomic layers. And we propose anunprecedented concept dubbed as slidephononics, where the phonons andassociated physical properties can be controlled by varying the intrinsicstacking configurations of slidetronic vdW materials. Based on thestate-of-the-art first-principles calculations, it is demonstrated that thethermal conductivity of boron nitride (BN) bilayers can be significantlymodulated (by up to four times) along the sliding pathways. Detailed analysisreveals that the variation of thermal conductivities can be attributed to thetunable (de-)coupling of the out-of-plane acoustic phonon branches with theother phonon modes, which is induced by the interlayer charge transfer. Suchstrongly modulated thermal conductivity via interlayer sliding in vdW materialspaves the way to engineer thermal management materials in emerging vdWelectronic devices, which would shed light on future studies of slidephononics.

Slidephononics: Tailoring Thermal Transport Properties by van der Waals Sliding