We investigate the thermal transport properties of three kinds of multilayer structures:a perfect superlattice(SL)structure,a quasi-periodic multilayer structure consisted of two superlattice(2SL)structures with different peri-ods,and a random multilayer(RML)structure.Our simulation results show that there exists a large number of aperiodic multilayer structures that have effective thermal conductivity higher than that of the SL coun-terpart,showing enhancement ratio in the effective thermal conductivity up to 193％.Surprisingly,some RML structures also exhibit enhanced thermal transport than the SL counterpart even in the presence of phonon localization.The detailed analysis on the underlying mechanism reveals that such peculiar enhancement is caused by the synergistic effect of coherent and incoherent phonon transport,which can be tuned by the structural configuration.Combined with molecular dynamics simulations and the machine learning technique,we further reveal that the enhance-ment effect of the effective thermal conductivity by 2SL structure is more significant when the period of SL structure is close to the critical transition period between the coherent and incoherent phonon transport regimes.Our study proposes a novel strategy to enhance the thermal transport in multilayer structures by regulating the wave-particle duality of phonons via the structure optimization,which might provide valuable insights to the thermal management in devices with densely packed interfaces.

Cuiqian Yu;Yulou Ouyang;Jie Chen

Center for Phononics and Thermal Energy Science,China-EU Joint Lab for Nanophononics,MOE Key Laboratory of Advanced Micro-structured Materials,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China

物理学前沿

[1]Cuiqian Yu;Yulou Ouyang;Jie Chen-.Enhancing thermal transport in multilayer structures:A molecular dynamics study on Lennard-Jones solids)[J].物理学前沿,2022(05):51-61

2SL,terpart

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